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Old 05-14-2012, 08:04 AM   #15420
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Join Date: Mar 2009
Location: Denver, Colorado
Posts: 3,853
My Ride: 2004 SG M3 ESS-550
Originally Posted by Andy2108 View Post
Or a bad cat...
Originally Posted by Rubenk View Post
I've never had a bad 02 sensor or bad cat make a car run weird, but I suppose the bad 02 could cause the ECU to make things misbehave.
Yeah a bad cat would make you through a code for emissions not cause cylinders to misfire. I'm betting that it's the 02 sensor on the 1-3 header. I've seen this happen on a number of cars. I remember when I did my header install and switched the 02's around and it made the car run like crap.
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