The check engine light recently came on and I checked the code. Told me to change out the O2 sensor, so I did. Check engine light is still on. Checked the code and nothing, just the 12 for beginning and 55 for end. I'm confused! I need to get her regd in Calif by December. Not sure what to do now...

 

What engine/year?

Clear the code with a code reader or disconnect the negative battery terminal. Realize though you'll have to go through a full drive cycle before you'll pass inspection. At least that is how it works in nj.

 

I have a 94, so cant use the code reader. I have also tried to disconnect the battery cables. First for 45 min...Now trying overnight...

BTW, all my jeep info is under my username...

 

I was going to say....for quite a while we didn't have that. Now we do again, IF people take the time to fill it out! It's a Grand Cherokee though. ZJ.

Touch the 2 cables together to discharge the capacitors in the PCM, wiping out the memory in it. Overnight should do it anyway.

 

For a long time we didn't have that. Didn't realize it was put back.

 

Not all of it. We used to be able to post t/case and tires, etc, but now it's just year, model, and engine. I wish guys would post location because it helps to know what environment it's operating in. I once tried to help a jeeper with a cold starting problem. It finally came out he was in Oahu while I was freezing my nuts off here in Syracuse at -15*. His idea of a cold start was 67*! He had to warm the PCM with a hairdryer to get it started.

 

Welcome to the forum.

The DRB II is a very handy tool for this vehicle, as-shown in this topic.

 

Lol...that's funny there. Well I guess not for you at the time, but funny Dave.

 

I get so frustrated some times trying to beg info out of posters, I sometimes turn the computer off and go to bed! Not really, but sometimes I'm tempted.