I don't know how smart the OBD II is on my 98 Surburban. The car has
100K mi on it and the O2 sensors may well be original. Before I think about changing them, will the OBD II give me any indication that they need to be replaced? Car runs fine and passes smog, but as we all know, O2 sensors degrade gradually. Any thoughts?Thanks,
-- cb
the number one cause for o2 sensor failure is them being clogged or dirty whatever u want to call it it but if you are worried about them just take em out and torch the tips off to burn off that carbon build up. or if u dont want to take them out then run the car lean for about
2 minutes and it should get the carbon off. u can do this by unplugging a large vacuum hose and just let it idle.
You forgot to tell him how to deal with the resulting MAF sensor code set by creating that large vacuum leak.
Thanks, guys. What I think I heard you say is that the check engine light will come on if the O2s are dirty. I have torched O2 sensors to test them, but didn't know that a good torching would clean them.
I also have a Jag XJ-S, it has MAP instead of MAF, so the vacuum leak cleaning process won't work on that car right? A vacuum leak will probably make it run rich on idle.
-- cb
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