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Catalytic Converter Questions

9K views 20 replies 8 participants last post by  flflash 
#1 ·
My check engine light came on last thursday, and i went to a mechanic and he told me it was a bad reading from my catalytic converter. He cleared the check engine light, and told me if it happens again come back. It came back on today, and i was wondering what could be wrong. Has anyone had this problem before, could if be just a simple O2 sensor? Any help would be appreciated.
 
#3 ·
Your profile says your jeep is an 05. If you got under 80k you are still under the emmssions warrenty. If you do have a bad cat they are expensive because its a whole y pipe assembly with 3 cats.
 
#10 ·
Its a federal law they have to fix it under warranty. 1 thing they will do is replace the 02 sensor to see if that fixes it. They might charge you for that. But when that doesn't work they will have to replace the cats for free.

0431 is the rear pre-cat, lower o2 sensor. The sensor might be bad, but its most likely the pre-cat that is toasted.
 
#17 ·
It wont hurt anything but if they are on national backorder again its first come first serve so get it in there to get your name on the list.
 
#19 ·
The cats for the newer tj's are a together in one y-pipe assembley. Theres 2 precats and one main cat. so when they go bad all 3 get replaced.
 
#20 ·
someone has a picture of the whole catalytic system? from manifold to exhaust? I think i need to replace my cat and i would like to know what do i need to replace.

thank you
 
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