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Old 07-20-2010, 05:15 PM   #1

Drives: 2014 2SS/1LE
Join Date: Feb 2007
Location: wpb fl
Posts: 3,133
Help with Codes

My CEL came on today. I scanned the codes and cam up with these.
P0420-Catalyst system efficiency below threshold Bank 1
P0430-Catalyst system efficiency below threshold Bank 2
P1133-Bank 1 Fuel control shifted lean (FAOSC) (see pg. 2096)
P1153-Bank 2 Fuel control shifted lean (FAOSC) (see pg. 2098)

I have LT headers and a tune. What would cause this? I thought maybe a bad O2 sensor, but both banks are bad. I lowered the car and recently rubbed the exhaust on a speed bump. I think this may be th ecause but what component is the issue? It doesn't sound like there are any exhaust leaks. Thanks.
Used Racing Brake 2 Peice Rotors for sale:

Summit White 2014 2SS 1LE
Recaros, NPP exhaust, Nav
2010 2SS A6 - sold.
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Old 07-21-2010, 10:17 PM   #2
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Drives: Black RS/SS M6
Join Date: Jun 2009
Location: TX
Posts: 233
With both banks showing a problem it has to be system wide. Something that will effect the engine as a whole. I do wonder if you may have a slight exhaust leak.
I have seen exhaust leaks that will make very little noise and will draw air into the exhaust throwing the computer off.
How long have you driven the car after the tune? Who did the tune?
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