'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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