Check engine/ airbag light issue - 2002 Jeep Grand Cherokee?

Question

I have a 2002 Jeep Grand Cherokee with just under 116,000 miles on it. My airbag light has been on for a few weeks - I have had it looked at and there are no codes coming up that are associated with the airbag. I do have an O2 sensor code, but no check engine light. I also haven't noticed my check engine light when starting my car.
My question - It is possible for the check engine light to burn out, or could this be a bad sensor? Also, would the airbag light be coming on instead of the check engine light as a safety measure? It is easily fixable? I've mentioned this to a few people including the mechanic I was at last week (getting a new Throttle Position Sensor and tune-up) and I just get blank stares, so either this really isn't an issue or I am explaining it wrong.  I'm hoping someone here can help! 
Thank you!

Anonymous · Accepted Answer

try unhooking the battery for a bit to reset the computer.   If you do not have a check engine light then you may be fine.   If you have OBDII diagnostics, turn the key on off on off on without starting the engine.   The odomoeter (if it is digital) should display a code or codes if something is wrong.  If nothing is wrong it will say done.   If you do not have OBDII your check engine light will flash in different sequences.   Each flash represents a number that you can check on line.   

I would recommend a haynes or Chiltons manual .   Jeeps are fairly easy to troubleshoot and repair yourself with some torx wrenches and a little mechanical ability.

? · Answer

has the vehicle been in an accident or had any aftermarket elect component added that you know of? i agree with you, o2 sensor probably not, wiring issue more than likely. i doubt if it's the harness, more like a short somewhere that would effect the pcm thus setting the code. Now, just have to figure out in addition to the headlight switch being turned on, the short( I assume it's a short) is setting the code by effecting another elect part, like maybe the alternator somehow. i believe that has an internal regular (in the alt.). i wish you luck on this one my friend, elect problems can be a nightmare as you know and is why shops charge $100.00 hr. sometimes to diagnose elect problems. ps: at least when you reset, the light stays off so it's not a hard code, but, that would be easier to diagnose but. probably more expensive to fix.

Check engine/ airbag light issue - 2002 Jeep Grand Cherokee?

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