Jump to content

Running Lean


Recommended Posts

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.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...