P0051low severityPowertrain
HO2S Heater Control Circuit Low Bank 2 Sensor 1
on 2003 Mazda MX-5 Miata 1.8L I4 · RWD
What this code means
Low voltage in the Bank 2 Sensor 1 O2 heater circuit.
Symptoms
- Check Engine Light
- Extended warmup emissions
Common causes
- Short to ground
- Faulty sensor
- Corroded connector
Diagnostic steps
- Test voltage
- Check for shorts
- Test resistance
Repair notes
Repair or replace sensor.
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P0002
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P0010
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P0011
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P0014
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P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1