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'97 Blazer O2 Sensor P0155

BowTieDude

By BowTieDude
in Ask A GM Technician

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BowTieDude

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Hey guys. My blazer is throwing the p0155 code (Heated Oxygen Sensor Heater Circuit Bank 2, Sensor 1). Can someone tell me for sure which sensor this is, just to make sure I'm not losing my mind. I think it's the first sensor down from the manifold on the pass side. Is that right? That sensor was replaced prior to me buying the vehicle, guess they thought it was the sensor causing the problem. I'm thinking maybe a bad connection somewhere, just want to make sure I'm troubleshooting the correct sensor. Any other tips would be appreciated too. Thanks in advance.

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