P0155low severityPowertrain
O2 Sensor Heater Circuit Bank 2 Sensor 1
on 1997 Cadillac DeVille 4.6L V8 Northstar · FWD
What this code means
Malfunction in the upstream O2 sensor heater on Bank 2.
Symptoms
- Check Engine Light
- Extended warmup emissions
Common causes
- Faulty heater
- Blown fuse
- Wiring issue
Diagnostic steps
- Check fuse
- Test heater resistance
- Inspect wiring
Repair notes
Replace O2 sensor.
Other Powertrain codes on this vehicle
P0001
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P0002
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P0004
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P0010
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P0011
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P0013
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P0014
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P0015
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