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P0155 O2 Sensor Heater Circuit Fault in Chevy S10: Why Code Persists After Replacement?

Model: Chevy S10 Fault Code: P0155 Posted: 2019-06-11 16:19

The check engine light has activated on my 2003 Chevrolet S10. A diagnostic scanner reveals code P0155 — Oxygen Sensor Heater Circuit Malfunction (B2S1). I replaced both oxygen sensors as recommended, and the check engine light has since turned off. However, the scanner still displays P0155. Why does this code remain after sensor replacement? I need to clear it to pass emissions testing for my truck.

Related fault codes

P0155

Comments (3)

Anonymous 2019-06-13 12:26

I took my Chevy S10 to Advanced Auto and had them scan it. The device detected P0155, but the technician mentioned it was showing as 'pending'. I've never seen this before — they couldn't confirm how long it would take for the code to clear on its own. They advised simply driving the vehicle under normal conditions.

Anonymous 2019-06-13 19:30

Have tried unplugging the negative battery cable and leaving it unplugged for about 10 mins and turn light your head light on to drain the remaining power that is stored in your pcm/ecm. that should remove the code for good.

Anonymous 2019-06-20 11:48

If you've already replaced both oxygen sensors and the issue persists, it's possible that the P0155 code isn't solely due to sensor failure. Other factors such as wiring issues, connector corrosion, or a faulty heater circuit in the sensor harness could be contributing. Further diagnostics may be needed.