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Codes are showing both front O2 sensors are bad. i replaced both and codes reappear.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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bunnydawg
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SOURCE: How many O2 sensors on a 1997 Lexus ES 300?

according to the manual i have... it has three.... one in the exhaust manifold.... and two in the exhaust pipe..... slightly vauge on the exact location of the last two sensors... but looks like it is after the catylitic converter.

Posted on Apr 15, 2009

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juggernautxt
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SOURCE: Code: P0133 - O2 Sensor Circuit Slow Response Bank 1 Sensor 1

is this a 4 or 6 cylinder?
if a 4 cylinder it will only have 2 o2 sensors
V6 will have 4 o2 senors which the sensor will be the right side of the engine first sensor.
1st sensor on exhaust, I recommend if you change one change all, as this will make the computer when it rechecks the system you have all clean/fast responding sensors.

if you have a slow response it means the sensor is dirty and not reading well, which is usually caused by minor misfires that the engine computer dismisses, so a tune up would be recommended too.

Posted on May 06, 2009

  • 28 Answers

SOURCE: Code P0141. O2 Sensor heater circuit fault (Bank1,

It is probably the sensor before the cat. if it has a heater. The heater circuit going bad is a common problem, it does not affect the way the car runs after it warms up, it is an emission device to heat the O2 sensor up quicker than the hot exhaust gas would. It should be replaced because it will keep your check engine light on and you would not be able to pass an emission test.

Posted on Oct 12, 2009

YIRMASTER
  • 32 Answers

SOURCE: I have a 2001 Chrysler Sebring LXI Coupe 3.0 mitsu

A great tool to have that can save you some money to read computer error codes and clear them after work has been done can be had for under $100 from Actron. This is what I have been using and its a life saver but it's also good to have the vehicles repair manual as well.

The computer on this car is OBDII like many other vehicles out there these days so you'll need a tool that can plug in and read the outlet located above the shin of your right leg under the dashboard or steering wheel. Here is a link to a bunch of their products on amazon Actron and other OBDII Computer diagnostic code reader tools.

Posted on Jan 11, 2010

  • 615 Answers

SOURCE: '05 PT Cruiser O2 sensor problems.

I had a similar problem with my car. It turned out the O2 sensors were fine and the issue was a leak in the throttle body causing the engine to run lean. If you have an ODB2 scanner you can look at fuel trims, etc and will be able to tell.

Posted on Mar 28, 2010

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2 Answers

What does code #P0171 mean for a 96 Villager?


"System too lean (bank1)" O2 sensor is giving this error code. There are two O2 sensors one near the engine and one downstream. It could just be an anomaly or the sensor could be going bad. (Bank 1) is the O2 sensor closest to the engine. I had a PT cruiser that constantly gave this code even after replacing both sensors. If the car seems to run fine, clear the code and see if it reappears immediately. If it does then the O2 sensor is probably bad. If it doesn't come back then it was probably an anomaly. I would get this code every 2 or three months on the PT cruiser and would just clear the code to turn the check engine light off as the car ran fine.

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2002 Santa Fe with P0031 code (O2 sensor, bank 1 sensor 1). Replace sensor, cleared code and code reappears. On the OBDII, the code shows under transmission and engine. Do I need to clear the code


I guess I should start by saying that trouble codes do not instruct the mechanic to replace a component. Only to check it.
Code 31 is for a problem with the heater circuit for that O2 sensor. The sensor is not warming up fast enough to satisfy the engine computer. Since you have replaced the sensor, the actual problem could be in the wiring or the source of power for the heater built into the sensor.

Sep 15, 2014 | 2002 Hyundai Santa Fe

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My SLK 280 2006 is showing the Check engine light ON and the gear not changing neither by automatic drive or tiptronic drive. checking by computer fault log it shows first the O2 sensor malfunctioning. I...


replace the speed sensor as it controls the shifting of the transmission. When replacing any units the fault s will continue to reappear unless you have the CPU reset by a fault code reader.

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Hi, I have a 1999 Saturn SC2 and my service engine light came on. I did a diagnostic on it and the code showed P1133. The guy at the auto shop told me it's an oxygen sensor, but didn't know if it was the...


First, I wouldn't let that guy work on your car. P1133 is "O2 Sensor Slow Response - Sensor 1" Anybody that has been in the auto repair business for more than a week should know that Sensor 1 is ALLWAYS the FRONT sensor.

Note: O2 sensor codes do not necessarily mean that an O2 sensor needs to be replaced. Most O2 Sensor codes are caused by something other than the O2 Sensor itself. (there are several different possible O2 Sensor codes for your car. P0131, P0132, P0133, P0134, P0138, P0171, P0172, P1133, P1134)

The most likely cause of DTC (Diagnostic TroubleCode) P1133 is contamination of the O2 Sensor. Replacing a contaminated O2 Sensor without repairing the source of the contamination will only result in a repeat repair. It could be caused by bad fuel, improper use of RTV sealant, engine oil or engine coolant. I have seen this caused many times by engine oil leaks that run down the exhaust and clog the holes in the side of the sensor shield. (The sensor must "breathe" to work properly)

Then on the other hand, if your vehicle has a lot of miles on it, the sensor could be just chemically worn out. In any case, the FRONT sensor is the one that is setting the code.

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I've had my camery 2002 modle placed on a computer because the check engin light. Keeps showing an the machine shows that I have a bab cadlelac converter what do I do to fix it ?


Catalytic Converter. You cant fix it, you replace it. But converters just dont "go bad" you need to find any running problem and fix it or the new converter will go bad in short order.

Jun 23, 2010 | Toyota Camry Cars & Trucks

1 Answer

I got error code for bad o2 sensor. and MAF sensor


you're looking at this the wrong way, i suspect you have an engine problem, do a compression and leak down test, also look for a vacuum leak after the maf sensor

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2 Answers

5 error cods on my 2002 Jetta GLS 1.8 Turbo Engine


P0420= Catalyst System Efficiency Below Threshold Bank 1
P0300=Random/Multiple Cylinder Misfire Detected
P0301=Cylinder 1 Misfire Detected
P0172=System Too Rich Bank 1
P2181=Cooling System Performance
you need to write these down,have someone clear the codes in the car,then go for short ride and recheck which if any code reappears.it's like domino's affect,one sensor can start a chain affect with the others.

Dec 09, 2009 | 1998 Volkswagen Jetta

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O2 sensors trouble codes come back/after being replaced


What were the codes??? You should have gotten one code if it was only one O2 sensor that went bad. If all three O 2 sensor went bad you would have gotten three different codes. P0031 (bank1 sensor1) P0051 (bank2 sensor2) P0061 to P0064 O2 sensor after the catalytic. Hops this helps. 

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More indepth explanation of scanner codes for 98 Toyota Camry


All of these codes are for a bad A/F sensor (O2 sensor) bank # 1 sensor # 1 nothing to do with spark plug of gas cap. Replace this sensor and your code will go away.

Jun 06, 2009 | 1998 Toyota Camry

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