Question about 2002 Toyota MR2 Spyder
2002 MR2 fuel system too rich bank 1 and bank 2 Check engine light was on and dealer diagnosed the problem as needing to replace all 3 oxygen sensors. I replaced all 3 sensors and now I am getting p0172 and p0175 codes. LTFT for both banks was at -42%. I reset the codes and also disconnected the battery to reset the LTFT to 0%. Drove the car about 30 miles and the MIL light came on again showing the same 2 codes. If I was sold the wrong oxygen sensors could that cause this problem? Peter. The dealer did diagnose the problem. They said the car needed all 3 oxygen sensors replaced. They were replaced and the car is now returning codes p0172 and p0175 which are the only 2 codes coming up when the check engine light came on. My question is if the dealer sold me the incorrect oxygen sensors could this cause the computer to incorrectly set the p0172 and p0175 rich fuel mixture codes. There are no other codes coming up. My plan at this point is to check and clean the MAF, check my fuel pressure, and also the TPS but I did not want to waste my time if it could possibly be that the new oxygen sensors where the problem. Any help would be appreciated.
Fuel sensors work in the hottest part of the exhaust and are difficult to remove after a period of time. Many mechanics apply a small amount of never seize to the threads to assist in replacement and future removal. However this affects the grounding of the sensor and can cause fault readings. Ask the mechanic if he did that and follow you idea that the sensors may aftermarket and not suitable for yoyr car
Posted on Jan 23, 2013
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Posted on Jan 02, 2017
What is the mileage on that car? If the MAF sensor would be acting up, you get tip in acceleration hesitation, it sounds like the Air bypass valve is having issues. Replace it. Do not clean it just replace it.
Posted on Aug 29, 2011
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