Mechanics

P0135 ERROR CODE AND INCOMPLETE O2 AND CATALYST MONITORS

2002 Pontiac Montana • 151,000 miles

I just moved to Indiana and found out this morning that my car doesn't pass the emissions standards because of the P0135 error and incomplete o2 and catalyst monitors. The check engine light was also on, and had been on for as long as I can remember. After leaving the emissions test site, I went and got the o2 sensor and replaced it. The check engine light went off and stayed off for about 35 minutes but came back on. I'm now trying to figure out what else I need to do. I've gotta get this vehicle up to par so I can get it plated. What is a catalyst? Would that incomplete monitor make the light go back on? If so, how do I fix that? I'm feeling pretty lost right now, any info would be greatly appreciated.
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Dudenamedric
June 24, 2012.




No good shop works for nothing. They will and have to charge you for the actual diag as it is more than reading a code number. Be prepared to spend if you want it fixed right

Roy

ASEMaster6371
Jun 24, 2012.
Went to autozone and advance, got the same error code for both. P0420, catalyst system operating below threshold, and the code appeared twice. One guy said I simply have to drive it a certain way to set the catalyst monitor, another said I need a new catalytic converter, so I dunno. No errors for the o2 sensor tho so that's better than what it was. Any ideas?

Tiny
Dudenamedric
Jun 24, 2012.
If you have a code P0420 that isnt going to just go away from driving it a certain or the cat monitor isnt going to reset. You most likely need a new cat.
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Saturntech9
Jun 24, 2012.

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