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If it's idling better with the check engine light on then maybe the mass air flow sensor is going faulty? just a guess, but when the light is on, it's using mapped values and not sensor inputs. I do know for a fact a bad mass airflow can throw O2 sensor codes. Too lean AND too rich from the same sensor or all sensors usually points to this. A buddies Thunderbird was doing this and running terrible, we unplugged the Mass and it ran fine until he could afford the $150 to buy a new one.

Well, I said it's actually idling better now because I had the batterfly vacuum leak problem before.<img src="/forums/images/graemlins/shiner.gif" alt="" />
The check engine light only came on after the vacuum leak problem and is solod ON not flasing.
If I disconect the battery (reset) it goes away but then comes back on after some driving. <img src="/forums/images/graemlins/confused.gif" alt="" />
Is there anyway to test if the 02 sensor is bad? (whitout having to buy a new one first)

[b]94/95 Montero SR "rockcrawler"
Riding on 37" MTRs