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'07 TrailBlazer SS P2A01, P2A04, and P0420 codes

 
Old 09-09-2014, 10:13 AM
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Default '07 TrailBlazer SS P2A01, P2A04, and P0420 codes

P2A01 - O2 Sensor Circuit Range/Performance Bank 1 Sensor 2
P2A04 - O2 Sensor Circuit Range/Performance Bank 2 Sensor 2
P0420 - Catalyst System Efficiency Below Threshold (Bank 1)

Replace both downstream/post cat/rear O2 sensors, and see if the code goes away?
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