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07-13-2008, 10:53 AM #1
- Join Date
- Jan 2006
- Location
- Grayslake, IL
- Age
- 44
- Posts
- 8
Blue- 1999 Trans Am WS6
420/430 code after header install
I just installed a set of MAC mid length headers with a catted Y-pipe and my check engine light came on. I went to Autozone to have it scanned and it read the P0420 and P0430. The reason I put new headers on was b/c I pulled a 420 code earlier so I figured I had a bad cat. My passenger side O2 should be the same one I used before which wasn't throwing any codes, but I changed out the drivers side with one that came with the y-pipe ( I bought the header/y-pipe used with less than 1000 miles on it and it came with 2 02 sensors in it).
Any ideas?'99 Trans Am WS6
MAC mid length headers, catted y-pipe, Flowmaster muffler, cut out, FRA
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07-13-2008, 10:55 AM #2
- Join Date
- Aug 2005
- Location
- Thornton, CO
- Posts
- 23,773
Red Tint Jewelcoat- 2008 Trailblazer SS
Get them tuned out.
The problem is that while a high flow cat works, it doesn't work 'well' enough to keep the codes from popping up.
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07-13-2008, 12:26 PM #3
- Join Date
- Jan 2006
- Location
- Grayslake, IL
- Age
- 44
- Posts
- 8
Blue- 1999 Trans Am WS6
Does it hurt anything by driving the car like this? I haven't noticed my fuel economy being any worse, but this is also just a weekend car.
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07-13-2008, 12:36 PM #4
- Join Date
- Aug 2005
- Location
- Thornton, CO
- Posts
- 23,773
Red Tint Jewelcoat- 2008 Trailblazer SS
Nope. Hurts nothing.
The ONLY thing those rear O2's do is compare levels to the fronts. To determine if the cats are working 'properly.'
The fronts assist in the control of the A/F.
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07-13-2008, 06:21 PM #5
Quick question. I've gotten my pacesetter headers ordered along with the ORY. The headers will have a place for the O2 sensor? Do I have to go to a dyno shop to get the rears tuned out, or can I get a handheld unit to tune them out?
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07-13-2008, 06:55 PM #6
- Join Date
- Nov 2006
- Location
- Broken Arrow, OK
- Age
- 49
- Posts
- 23,345
Pewter metallic- 2000 Camaro SS
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07-13-2008, 06:56 PM #7
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07-13-2008, 07:05 PM #8
Thanks for the info guys. Just hope I'll get ample performance out of it.
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