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po155 code on 2004 Chevrolet Blazer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
getting a PO155 code, already chanced oxy sensor, what could it possibly be
(1) Answer
The other O2 sensor??
Which one did you change? The P0155 s for the B2S1 - Bank 2 , the O2 sensor before the catalytic converter.


Zee