I've been working on my 00 XJ for a while , yet still can't make that damn light go away . Here's what I've got :
P0130 , P0136 , P0443 , P1491 P0705 .
I have tested for any short I could think of . I've replaced all four O2 sensors ( I think this is a California Emmisions equiped vehicle ) and the relays associated with each bank of sensors , the Cam Position Sensor , the Crankshaft Position Sensor and I've even gone so far as to replace the ECM with another unit from the junk yard . After eliminating the codes with my meter , they resurface after the second or third start up . Oddly enough , the Jeep runs great , possibly even smoother now ! Any ideas ?

 

Problem is obviously not the PCM then. Start looking for a bad connection/connector and/or ground issue. Is this a flood salvage vehicle by chance?

 

My check engine light was on. They told me my gas cap wasnt tight.. Kept coming on. I replaced the gas cap and it went off forever.

 

If I had a dollar for every unfinished thread... I'd be extremely middle rich... This is exactly my problem and there's no more info... Big sad

 

Yeah I've run across a lot of that lately. I've been a little slow at work so I've been doing A LOT of reading. Seeing that, and members who seem to be one of the top posters and commenters with like 6,000 posts and have a sweet looking jeep, then you look at their profile and they're last activity is from March 2017.......