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check engine light

scottyrock

New Member
Joined
September 6, 2009
Messages
7
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City, State
Springfield Missouri
Year, Model & Trim Level
96 limited
96 limited 4.0, 4x4, auto. I have been fighting the check engine light for awhile now. First code said bad cat. I replaced it. Light was off for about 4 weeks and came back on. That time the code was for bad o2 and cat. My mechanic suggested having the computer reflached because the o2 sensors were functioning fine. I had it reflashed, light was off for about 100 miles now it is back on. I have yet to scna it again. Any ideas?? The truck has 110,000 miles.
 



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a small exhaust leak upstream of the o2 sensor could be causing the light to come on,
the hole would be just big enough to allow enough air in to make the sensor show a code,,
 






Had it scanned this morning. Code 171/174 was shown....MAF. Where is this located? I think I will take my chances of cleaning it first.
 












Thanks guys. Looks like I need to replace the intake gaskets as you stated.
 






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