p0137 and p0420

forgetg · **Joined:** Tue Jan 27, 2009 7:37 am **Posts:** 2

Good morning all, great forum, I have a 2002 grand prix with the 3.8 engine...I had the cat changed with a A/M, they welded the new cat on ..ran ok for a while, the sound was a bit louder and now I get codes p0137 and p0420, in reading the threads..should I check for leaks and change the o2 sensor after the cat....
Thanks for your help..

Sponsored Links · **Joined:** 29 Jun 2004 08:12 pm **Posts:** N/A

asecmt · **Posted:** Tue Jan 27, 2009 6:19 pm

With the P0137 you can look at that first, could of been damaged during converter replacement. I would be better if you could get some data to see what the O2's are reading. I dont like aftermarket converters esp. if they have to be welded in. They just dont work.

forgetg · **Joined:** Tue Jan 27, 2009 7:37 am **Posts:** 2

how can i read the data..can i do so with a digital volt meter or do I have to use the analyzer at advance auto?
Thanks

MR OConnor · **Joined:** Sat Feb 21, 2009 10:02 pm **Posts:** 2

You'll need to gain access to an good quality analyzer, one with a screen. The O2 sensor test screen data will look like the screen shot in this post....

http://www.obd-codes.com/forums/viewtopic.php?f=1&t=4359

Best if you know the spec range for the O2 sensor for this vehicle to be able to make a comparison. Some top end analyzers have that data range programmed into them already.

p0137 and p0420

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