I have a 2000 Ford Ranger with 95,000 miles and a 3.0 liter engine that has had an intermittent check engine light for the last few months. It will ocassionally idle rough and also have strong odor from the exhaust. It had the OBD codes checked and they came up with P0133, P1131, and P0171. These all seem to indicate a lean air/fuel mixture. I could not find any vacuum leaks. How can I diagnosis my problem?
If you haven't changed the o2 sensors yet try that. They send the signal to PCM to adjust mixture.
July, 1, 2007 AT 2:22 PM
Is there any diagnostics to do before randomly changing parts?
July, 5, 2007 AT 12:42 PM
Without spending a few thousand dollars on test equiptment, you diagnose partially with OBDII codes! Wich you already did? They point to the O2 sensors. Last reply here!
July, 10, 2007 AT 6:52 AM
Well first of all there are 4 sensors on my truck. Are you saying I should replace all of them? I don't think so. There are procedures for running down the causes of computer codes, I thought maybe you knew them. Obviously you don't. Your plan is to keep replacing parts until the problem is fixed.