po155 code on 2004 Chevrolet Blazer

getting a PO155 code, already chanced oxy sensor, what could it possibly be

by in Alsip, IL on October 08, 2010
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1 answer
ANSWER by , October 08, 2010
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