rudecuban Posted November 12, 2006 Share Posted November 12, 2006 Hey guys, i have a 2000 Es300 and the check engine light is back on again. code was read at auto zone , P0171. I have read about the things to check, loose air hose, incoreect fuel pressure,etc. I have cleaned the MAF sensor in the past and it has worked for about a month with good results, but the check engine light always comes back on. I went and bought a new MAF sensor and guess what? The light comes back on. I havent been able to find any air leaks, and the fuel pressure is ok. I changed the plugs today and they were pretty white. so it is obviously running real rich. I am going to check the resistance of the MAP sensor tomorrow and the ECT sensor also. Could the problem be coming from a bad o2 sensor? If any of you guys have run into this problem and could give me a direction to go, it would be greatly appreciated. The car doesnt run that bad , other than being sluggish, but i dont think it is good for the motor running that lean. Thanks in advance for any helpful replies. Quote Link to comment Share on other sites More sharing options...
Toysrme Posted November 12, 2006 Share Posted November 12, 2006 Because P0171 is bank-1 too lean. You shoulda started by checking the bank1 (Rear bank) o2 sensor. Quote Link to comment Share on other sites More sharing options...
rudecuban Posted November 15, 2006 Author Share Posted November 15, 2006 Because P0171 is bank-1 too lean. You shoulda started by checking the bank1 (Rear bank) o2 sensor. am i correct to say that the rear bank o2 sensor is behind the catylitic converter? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.