0420 & 0430 codes - Pontiac G8 Forum: G8 Forums - G8Board.com
 
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post #1 of 3 (permalink) Old 03-23-2017, 10:47 AM Thread Starter
CBR629
 
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0420 & 0430 codes

New Kooks headers with hfc and Solo exhaust install now getting these codes any help would be appreciated
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post #2 of 3 (permalink) Old 03-23-2017, 11:22 AM
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It needs to be tooned

PBM G8 GXP M6-Self flex fuel tune,OBX LTs, Kooks A/B, Monster clutch, 3.45 gear,LSA S/C, cam, fuel system, stock block and stock heads, 12 PSI.
Best e.t 10.41/ best mph 138.7 Half Mile: 168.3 mph
2007 TBSS-Self tune, bolt ons [email protected], 1,560 D.A
1991 GMC Syclone- Self tune/catback [email protected], 4,200ft D.A
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post #3 of 3 (permalink) Old 03-23-2017, 11:34 AM
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The rear O2 sensors need to be turned off in the tune. Or if you aren't getting tuned, you need O2 sensor extenders such as: https://www.amazon.com/O2-Sensor-Spa.../dp/B00CZFCPQU

2009 G8 GT
2002 Corvette Z06
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