Time for a New Cat

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Jun 22, 2011 | 06:19 PM

#11

03SSLE

Thread Starter

Monte Of The Month -- August 2012

Joined: Apr 2011

Posts: 6,074

From: Seattle

Quote:

Originally Posted by The_Maniac

FYI - If the car DOES throw that P0420 code, a trick I was looking into when i first put a high flow cat on my Monte was a spark plug anti-fouler. The concept is to space the O2 sensor out of the main exhaust stream, reducing what exactly it receives for readings. I've read people with multiple different drive trains that claim success using that trick...since I had my PCM tuned, I had that code deleted from it at that time.

Thanks for the tip. Those anti-foulers are only a couple of bucks so I'll probably just put one on it from the get go and be done with it. I don't know if I could get away with having the sensor deleted from the PCM or not. From what I understand about the smog check around here they look to see that all the sensors have run their self-diagnosis, and if one comes back that hasn't run you fail the test.