I have an engine code P2A01 Bank 1 Sensor 2 Performance on my 2005 GMC Sierra 5.3L
You must replace the rear O2 sensor Bank 1 (driver side, downstream)
P2A01 GMC - O2 Sensor Circuit Range/Performance Bank 1 Sensor 2 Read more: https://www.autocodes.com/p2a01_gmc.html
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