P0050low severityPowertrain
HO2S Heater Control Circuit Bank 2 Sensor 1
on 2013 Mazda CX-9 3.5L V6 · AWD
What this code means
The PCM detected a malfunction in the heater circuit of the upstream O2 sensor on Bank 2.
Symptoms
- Check Engine Light
- Poor fuel economy
- Longer warmup emissions
Common causes
- Faulty O2 sensor heater
- Blown fuse
- Wiring damage
Diagnostic steps
- Check fuse
- Test heater resistance
- Inspect wiring
- Test PCM output
Repair notes
Replace O2 sensor or repair wiring.
Other Powertrain codes on this vehicle
P0001
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P0002
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P0004
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P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
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P0012
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P0013
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P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1