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Toyota p0031 of Technology

i have 2003 toyota camry, with code P0031, this is a o2 sensor fa.

P0031 is a generic code, which means that it has the same meaning for the Toyota Solara as it would any other OBDII equipped vehicle. As far as diagnostic trouble codes go, this is a relatively easy one to diagnose. It is usually caused by a bad oxygen sensor, or a wiring issue. Table ofP0031 is the code you should to be paying attention to. I don't think a new MAF sensor was required. P0100 & P3100; I'm guessing are just secondary faults caused by the bad sensor or harness. What puzzles me is you say you only removed the bank 1 sensor 2 (down stream) but the P0031 code indicates an issue with the bank 1 sensor 1 …Only show this user. #1 ·Jul 17, 2013. Hey Guys and Gals, I have a question regarding O2 Bank 1 Sensor 1 on my 2007 Sienna LE. I got a P0031 code which I cleared. It came back and now I would like to replace it. I heard it wasnt very nice to change but I want to try. I checked rockauto for the right sensor and there are options for this sensor ...P0031 is an automated generic code. The fault P0031 shows up when the engine exhaust does not maintain the air-fuel ratio.Aug 22, 2022 · P0031 is a diagnostic trouble code that indicates a problem with the air-fuel ratio sensor heater control circuit. Learn what causes this code, how to fix it, and what models of Toyota are affected by it.Model: III. We have 2010 Prius 3 with approx 170,000 miles. We have 3 codes P0031, P0102 and P0403. Took to our local garage and then said that the 3 sensors are on the same fuse. They found the fuse was blown. They replaced the fuse, cleared the codes and took for a test drive. In about 1 mile of driving the codes came back, the fuse …To diagnose the P0031 2007 Toyota Prius code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.2004 Toyota tundra v8 4x4 reg cab auto. p0031 p0051 bank 1 + 2. replaced both bank 1 +2 backflow o2 sencers. had trouble at 1st with fasteners then re threaded now perfect. check engine light went fro … read moretoyota prius codes P0031 p2237 Hi, to all of you toyota prius aficionados )))i got two codes: P0031 and P2237. I don't want to let the toyota dealership take advantage of me and charge me through the nose, so I need your help. what should the parts cost (approximation) and the replacement cost to get these codes cleared up? tha...Ted Ritter. High School or GED. 5,492 satisfied customers. Check engine light. P0031 and p2238 code. 2003 tacoma. First. yes first code was 0031 so i changed bank one sensor one after this the 0031 code went away and p2238 code came up … read more. Edward. Professional at Justanswer...Posts: 1,182. Swapped out O2 sensors and getting P0031 and P0051. Hey fellas, My GF and I swapped out both of her exhaust manifolds with the Dorman manifolds from Amazon, along with both Upstream O2 sensors (AFR). Figured, while we were in there, might as well do the O2 sensors. She bought Denso 234-4261 O2 sensors.Toyota is partnering with Suzuki Motor Corporation, Daihatsu Motor Co. and Commercial Japan Partnership Technologies (CJPT) to build mini commercial electric. Toyota is partnering ...END OF SPECIAL NOTES. OBD II fault code P0031 is a generic trouble code that is defined as, "P0031 - HO2S [Heated Oxygen Sensor] Heater Control Circuit Low Bank 1 Sensor 1", and is set when the PCM (Powertrain Control Module) detects an abnormal or unexpected voltage in the control circuits of the heater element of upstream oxygen sensor ...P0031 is a generic code, which means that it has the same meaning for the Toyota Prius as it would any other OBDII equipped vehicle. As far as diagnostic trouble codes go, this is a relatively easy one to diagnose. It is usually caused by a bad oxygen sensor, or a wiring issue. Table ofToyota P0031 & P0051 - YouTube Sienna manuals My 08 toyota sienna threw a p0015 code. i am hoping it is an ocv. Manuals oxygen awd v6 sienna 3l 3mz p0037 p01362004 sienna manual pdf 2004 toyota sienna p0037Does anyone know what the problem could be with a code p0037 on a 2004.P0031 is a generic code, which means that it has the same meaning for the Toyota Solara as it would any other OBDII equipped vehicle. As far as diagnostic trouble codes go, this is a relatively easy one to diagnose. It is usually caused by a bad oxygen sensor, or a wiring issue. Table ofToyota Forums By Models ; Avensis Club ; P0031, #07E8, HO2S Heater Control Circuit Low Bank 1, Sensor 1. eBay Disclosure: As the club is an eBay Partner, the ...The inspection guy put a rejected sticker and gave papers showing codes P0031 and P2195. Looking up online I see that P0138 corresponds to B1S2 oxygen sensor and P00331 and P2195 correspond to AFS B1S1. ... rav4world.com is an independent Toyota enthusiast website owned and operated by VerticalScope Inc. Content on rav4world.com is generated by ...Toyota codes lists this as a possible cause. Anyone able to fill me in on the fuse reference? Bank 1 Sensor 1 circuit fuse - Faulty Engine Control Mod ... Largest 4Runner Forum > Toyota 4Runner Forum > 4th Gen T4Rs > P0031 ...P0031 Have a 2018 hilux with P0031 coming up, do you know where to look? - Answered by a verified Toyota Mechanic. We use cookies to give you the best possible experience on our website. ... Hello, I had a P0031 code on my 2008 toyota highlander. Where is Bank 1 Sensor 1 located. Do you have a picture or engine layout on how to find the right one?How to fix a Toyota P0031 Code, "Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1)."Possible Toyota P0031 Code Causes:Bad Oxygen Sensor Wiring...2006 Highlander Hybrid P0031, P0138. I have been having CEL come on intrmittantly with either P0031 or P0138 and sometimes both together. I replaced the Bank 2 Upstream Sensor twice but I have not been able to solve the issue. The other code is for bank 2 downstream and I have not yet replaced that...Hello guys, My name is Steven, I do DIY projects and repairs on my cars, I'm not a certified mechanic and this video is for entertainment purposes only. If ...I have my 2003 Camry P0031 code. I just bought the new oxygen sensor, Denso 234-4624. The connector is not compatible, and the wire is not longer enough. So I did some splicing, and replaced it. After seconds, the light is on and still show the same code P0031. My car is Federal Emission, I think. I checked the voltage of the heater power ...Toyota codes P0031 P0051 only changed blown fuse to fix, (bank 2 sensor 1) (bank1 sensor 1) also fixed the VSC light and Trac Off light just by changing the ...GM's 90-year reign as the bestselling car maker in the US is over. Good morning, Quartz readers! Was this newsletter forwarded to you? Sign up here. Forward to the friend who’s alw...helpplease Discussion starter. 1 post · Joined 2013. #1 · Jun 8, 2013. I have a Tundra 2003 v6 3.4L and the check engine symbol came on. So I took it to Autozone and received a code of P0031. I was trying to find out what oxygen sensor is bank 1 and where is it located? thanks for any help that you can give me.Z. zeph123 Discussion starter. 1 post · Joined 2019. #1 · Oct 5, 2019. I have an 2008 Toyota Highlander (3.5L) V6. The check engine and vsc light. The OBD indicated code P0031 BANK 1 SENSOR 1. Wherw is BANK 1 SENSOR 1 located please???Still doing the same thing but now is reading p0031 p0051 p0102. So now I swapped out air fuel heater relay and didn't change anything. Please help guys still scratching my head! ... Custom Antenna Delete Cap for Toyota Tundra (1999-2023), Tacoma (1996-2016), FJ Cruiser (2007-2014), 4Runner (2002-2015), Sienna (2003-2014), Highlander / RAV4 ...P0031 - HO2S Heater Control Circuit Low (Bank 1 Sensor 1) I don't feel any loss of power during driving (for the moment). __ I decided to reset the errors log. The lights switch off. So I ignite the engine and …i have 2003 toyota camry, with code P0031, this is a o2 sensor failure. is there any way too determine which sensor is bad. i am told there is one before the converter and one after the converter. thanks jc. This code refers to the bank one sensor one sensor. Wich is the top one (pre cat) on a 4cyl.With P0031, the O2 sensor is informing you that the heater circuit resistance is lower than the normal operating range. This code will often appear with P0171 . It indicates that the FJ Cruiser has a lean condition. If these are the only two codes present, fixing what is causing P0031 will more than likely clear the P0171.Toyota P0031 & P0051 - YouTube. P0037 toyota corolla 2006 sport Toyota p0031 & p0051 07 toyota sienna code p0136 changing bank 1, sensor 2. Toyota sienna a1bb 466f. 2004 toyota sienna p0037Sienna toyota 2004 parts replacement partsavatar Toyota sienna code p0031 2006 locationP0037 toyota sienna bank1.Trouble code p0031 is a generic code, which means it can be triggered by more than one issue. Here are some of the causes; Defective 02 sensor. Outdated software or failure in the onboard computer. Damaged oxygen sensor wires or poor connections. Blown P0031 fuse. Faulty heater circuit or connectors.The cost to diagnose the P0031 2005 Toyota Highlander code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.The P0031 code means there's an issue with the sensor's heater circuit, not the sensor readings themselves. It might be the sensor, but it may be an electrical issue or a fault with the EFI Main Relay. ... A forum community dedicated to Toyota Tacoma owners and enthusiasts. Come join the discussion about performance, modifications, overlanding ...2003 Camry 2.4 4 cylinder p0031 and intermittent p2a00. What I've tried. According to Alldata: Check for 12 volts at car side of o2 sensor heater pins. Got 14v when running. Checked EFI relay for function and swapped it with another: No change. Check for resistance at HT and b+ pins on O2 sensor Mine checked fine.Toyota Forums By Models ; Avensis Club ; P0031, #07E8, HO2S Heater Control Circuit Low Bank 1, Sensor 1. eBay Disclosure: As the club is an eBay Partner, the ...What Does Code P0031 Mean? OBD II fault code P0031 is defined as “HO 2 S (Heated Oxygen Sensor) Heater Control Circuit Low (Bank 1 Sensor 1)”, with “Bank 1” referring to the bank of cylinders that …The cost to diagnose the P0031 2018 Toyota RAV4 code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour. Search for P0031 2018 Toyota RAV4 Questions and Answers: Search ...Labor: 1.0. The cost to diagnose the P0031 2009 Toyota Camry code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.2008 Sienna LE-code P0158 and P0031. Check engine light, VCS, and Track Off lights all on. went to Autozone and came up with these codes. P0158 and P0031. I replaced the gas cap today after reading other threads regarding common emissions issues. The car doesn't seem to run differently but my wife cant stop looking at the lights and blaming me ...MIL "ON" DTC P2195, P0138, and/or P0031 Service Category Engine/Hybrid System Section Engine Control Market USA Applicability YEAR(S) MODEL(S) ADDITIONAL INFORMATION 2009 Corolla Engine(s): 2ZR ... • This repair is covered under the Toyota Federal Emission Warranty. This warranty is in effect for 96 months or 80,000 miles, whichever occurs ...What Does Code P0031 Mean? OBD II fault code P0031 is defined as "HO 2 S (Heated Oxygen Sensor) Heater Control Circuit Low (Bank 1 Sensor 1)", with "Bank 1" referring to the bank of cylinders that contains cylinder #1 on engines with two cylinder heads, and "Sensor 1" referring to the oxygen sensor located before the catalytic converter(s), i.e., upstream of the converter(s).What is the Cost to Diagnose the Code P0031 2008 Toyota Prius? Labor: 1.0. To diagnose the P0031 2008 Toyota Prius code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type.p0031 dtcを修正するには、適切な診断を実行する必要があります。 これを行うには、センサーにつながる配線とコネクタを検査する必要があります。 また、ヒーターリレーとヒューズがある場合は、それらもテストする必要があります。323. Gender: Male. Queen Creek, Arizona. SR5 PreRunner. 3" lift front & rear, Air Raid Intake System. Nowhere does it say in the flow chart for either code, that an O2 sensor is involved. Both codes point directly to the air flow meter. The P2238 code points to an open circuit in A/F meter.p0031 dtcを修正するには、適切な診断を実行する必要があります。 これを行うには、センサーにつながる配線とコネクタを検査する必要があります。 また、ヒーターリレーとヒューズがある場合は、それらもテストする必要があります。Labor: 1.0. To diagnose the P0031 2006 Toyota Camry code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and …Código de avería OBD-II P0031 Descripción. Circuito de control de la calefacción del sensor de oxígeno (HO2S) bajo. El código de diagnóstico P0031 indica un problema en el circuito de calefacción del sensor de O2 de tu vehículo (banco 1, sensor 1). Sin embargo, para entender las complejidades de este código, primero debemos entender ...If you’re in the market for a new or used Toyota vehicle, finding a reputable and reliable dealer is crucial. With so many options out there, it can be overwhelming to know where t... This incompatibility triggered the P0031 code related As I said earlier, the car was throwing P0051 which is O2 sThis is the only ICD in Chittagong which is established on

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Just recently replaced an 02 sensor a month and a half ago. Now i got another check engine light. According to what the read out at Advanced Auto parts gave me was it threw a P0031 code, Bank 1; Sen 1, Heater Circuit if i'm reading this thing right. Of course they guy didn't know what it was exactly or if it was related to the A/C system …The short version is that my truck is throwing the P0031 code (O2 Heater circuit low voltage B1S1) but I can observe battery voltage on both heater wires, when truck is keyed on and when engine is running. ... Replacement for 1984-2022 Toyota 4Runner, 1995-2021 Tacoma, 2000-2006 Tundra Aftermarket Wheel - Black Closed End Lug Nuts $20.69 Spicer ...Check engine light on p0031. 2007 Toyota Camry 2.4, Stays on, Replaced a/f sensor. Checked wiring, replaced ecm, That's - Answered by a verified Toyota MechanicToyota camry le 2.4 manual. CEL on P0031. Jump to Latest Follow 2K views 11 replies 4 participants last post by cj1 Mar 4, 2021. RbadluckToy Discussion starter 7 posts · Joined 2021 Add to quote; Only show this user #1 · Mar 3, 2021. At a loss, new heated A/F (O2) sensor, correct one i did verify as this is a California emissions one. ...Sensor de Relacion Aire CombustibleCode P0031 2005 Toyota Highlander Description. Air-Fuel Ratio (A/F)sensor need to reach a minimum operating temperature of 1200 degrees F to produce an accurate voltage signal. The faster the air-fuel ratio sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module ( ECM ).With P0031, the O2 sensor is informing you that the heater circuit resistance is lower than the normal operating range. This code will often appear with P0171 . It indicates that the Venza has a lean condition. If these are the only two codes present, fixing what is causing P0031 will more than likely clear the P0171.Some companies have paused, while others are still bullish we'll all be driving in autonomous vehicles soon. After an Uber self-driving car struck and killed a homeless woman in Te...P0031 is a diagnostic trouble code that indicates a problem with the air-fuel ratio sensor heater control circuit. Learn what causes this code, how to fix it, and what models of Toyota are affected by it.p0031 dtcを修正するには、適切な診断を実行する必要があります。 これを行うには、センサーにつながる配線とコネクタを検査する必要があります。 また、ヒーターリレーとヒューズがある場合は、それらもテストする必要があります。The P0031 is set when the ECM detects an excessively low voltage through the heated oxygen sensor heater circuit. What are Code Possible Symptoms? Engine …To diagnose the P0031 2005 Toyota Corolla code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.4,754 Posts. #23 · Mar 4, 2008. JSM1284 said: It is a touchy subject when it comes to the 8/80 warranty. The warranty states it covers all components of the emissions control system. Thinking about it, The 02's, Evap lines/canisters, purge valves/solenoids, gas cap, etc, etc. Those are all components of the Emissions control system, however ...To diagnose the P0031 2005 Toyota Prius code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.Failed ECM: In rare cases, P0031 can be caused by a failed ECM. This can happen if the ECM is not properly sending or receiving signals from the HO2S sensor. The solution is to replace the ECM. Other issues: There are a few other issues that can cause P0031, such as a clogged catalytic converter or a malfunctioning fuel injector. These …P0031 code comes and goes do I need a new a/f sensor. 2006 4wd tacoma - Answered by a verified Toyota Mechanic We use cookies to give you the best possible experience on our website. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them.Still doing the same thing but now is reading p0031 p0051 p0102. So now I swapped out air fuel heater relay and didn't change anything. Please help guys still scratching my head! ... Custom Antenna Delete Cap for Toyota Tundra (1999-2023), Tacoma (1996-2016), FJ Cruiser (2007-2014), 4Runner (2002-2015), Sienna (2003-2014), Highlander / RAV4 ...If your Toyota Tundra 4.7L starter is having problems and is only starting intermittently, or not at all, then you will need to replace it. Fortunately, replacing the starter is no...Labor: 1.0. The cost to diagnose the P0031 2003 Toyota Corolla code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.40 views, 1 likes, 0 loves, 0 comments, 1 shares, Facebook Watch Videos from Kurt Tips and Triks Tv: Toyota corolla gasoline. P0031 oxygen sensor detected. Ano ang dapat gawin bago mag palit.2003 toyota camry o2 sensor location: q&a for p0031 dtc code Camry toyota 2003 2006 headlight 2004 lens cover altis lenses foggy haze xv30 yellowish replace crack 1600 headlamp le fogging Camry toyota p0031 2003 code upstream 4l replaced computer skyvisions sensor 4cyl. P0031 toyota tacoma. 2003 toyota camry images. photo 2003-toyota-camry ...Toyota is partnering with Suzuki Motor Corporation, Daihatsu Motor Co. and Commercial Japan Partnership Technologies (CJPT) to build mini commercial electric. Toyota is partnering ...5 posts · Joined 2017. #1 · Mar 12, 2017. P0031 TOYOTA - Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 1. 2004 Toyota Tundra "Regular Cab" V6, 3.4 L. I know this issue has been addressed before, but I just replaced my sensor with this unit: DENSO 234-9002 Air Fuel Ratio Sensor-OE | eBay.Rav 4 World is the internet's largest Toyota Rav4 SUV and EV online forum community. Discuss towing, modifications, and more. Show Less . Full Forum Listing. Explore Our Forums. 4.3 General 4.3 Mechanical 4.5 RAV4 Hybrid (except Prime) 4.3 Exterior 4.5 RAV4 Prime. Top Contributors this MonthTech Notes. The code means that there is a problem with the heater element circuit of the heated oxygen sensor. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow, which is a very common problem for this type codes. Before replacing the sensor, check for the condition of the heated oxygen ...The short version is that my truck is thro(Only single P0031 before relacement air-fuel sensor)

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P0031 is a generic code, which means that it has the same meaning for the Toyota Previa as it would any other OBDII equipped vehicle. As far as diagnostic trouble codes go, this is a relatively easy one to diagnose. It is usually caused by a bad oxygen sensor, or a wiring issue. Table ofP0057 in your Toyota Camry is most likely caused by a bad Oxygen sensor, or the wiring going to/from it. The swap test is a quick and easy way to verify if the sensor or wiring harness is causing the problem. Good luck! P0057 is a generic trouble code, which means that it has the same definition for the Toyota Camry as it would any other vehicle.To diagnose the P0031 2003 Toyota Corolla code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.hardtopte72. 14863 posts · Joined 2011. #3 · May 23, 2015. Sometimes the P0031 heater codes come up randomly. My Corolla got it around 3 times a few months apart. haven't had it in more than a year. As for belt, good thing you figured it out. You probably would have broke the tensioner head trying to get it on.P0031. Answered in 5 minutes by: Toyota Mechanic: Ron Z. Ron Z., - Toyota Tech -. Category: Satisfied Customers: 26,823. Experience: This p-code is pointing to a fault with the internal heater for oxygen sensor, Bank1 Sensor1. The PCM uses this internal heater to get the sensor to normal operating temps in a matter of seconds on cold starts.2009 toyota yaris check eng lite on code p0031 comes up/ change oxygen/ 02 sensor reset light comes back on in 15 seconds. Answered in 19 minutes by: Toyota Mechanic: AMD. AMD : Hello and thank you for trusting us with your Toyota question, My name is XXXXX XXXXX I will be assisting you today. AMD :In this video I go through a step by step process of diagnosing and fixing an engine management light on with a stored fault code of - P0031 Oxygen Sensor He...A little over 44,000 miles on it and dealer wants $1675.00 plus tax to fix it. P2195 - Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1) P0031 - Oxygen (A/F) Sensor Heater Control Low (Bank 1 Sensor 1) New exhust mainfold, new sensor, etc. dealer won't help with any cost, told me to call the 1-800-331-4331 number, but that's not taken …Check e code P0031. Jump to Latest Follow 9K views 7 replies 6 participants last post by sfe Oct 18, 2008. tacoma0309 ...Lookit: P0031 Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1) - DTC Code. Turning off the loght does not fix what's broken. That's why the light came back on. Thanks. The A/F sensor I replaced is a DENSO, second and. Seller listed it as working. I must find my DVM and check for 12V and heater resistance as suggested …Welcome to JustAnswer, my name is XXXXX XXXXX I'm here to help get your problem resolved. Ask follow up questions, thanks. They are correct, here is a picture of sensor. DTC P0031 Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1) Ask Your Own Toyota Question.Toyota Motor said it was recalling about 838,000 Sienna minivans to fix an issue that may arise while operating the vehicles' sliding doors. By clicking "TRY IT", I agree to receiv...P0012 Definition Toyota Corolla. The Toyota Corolla utilizes camshaft actuators to change the valve lift depending on the RPM of the motor. This allows for a more efficient cam profile at any speed. With P0012, the camshaft actuator is leaving the timing retarded. Camshaft Position Actuators change the lift of the camshaft up to 25 degrees.Gen 6: P0031 & P0051 post accident (now P0174 & P2197) I have 2 x P0031 and 2 x P0051 after an accident. I rear ended an SUV. My hood got bent and the radiator got pushed in. The body shop said they don't think it was due to an accident. I can't possibly have 4 sensors go on me. Any experts out there to give me some advice? Thanks!Woven Planet Holdings — an entity created by Toyota to invest in, develop and eventually bring future of transportation technologies like automated driving to market — has acquired...P0057 in your Toyota Camry is most likely caused by a bad Oxygen sensor, or the wiring going to/from it. The swap test is a quick and easy way to verify if the sensor or wiring harness is causing the problem. Good luck! P0057 is a generic trouble code, which means that it has the same definition for the Toyota Camry as it would any other vehicle.Code P0031 Toyota Description. The Engine Control Module ( ECM) uses information from the air-fuel ratio sensor to regulate the air-fuel ratio and keep it close to the stoichiometric level. This maximizes the ability of the three-way catalytic converter to purify the exhaust gases. 2004 Toyota Sienna P0031 and P0051. Jump to Latest Follow .