P0051
HO2S Heater Control Circuit Low Bank 2 Sensor 1
2014-2021 Mazda Mazda6 2.5L I4
Low SeverityPowertrainGeneric (SAE)
Description
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.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P0051 on Other Vehicles
Common Questions
What does code P0051 mean on a 2014-2021 Mazda Mazda6?
P0051 stands for "HO2S Heater Control Circuit Low Bank 2 Sensor 1". Low voltage in the Bank 2 Sensor 1 O2 heater circuit.
What are the symptoms of P0051 on a Mazda Mazda6?
Common symptoms of P0051 include: Check Engine Light, Extended warmup emissions.
What causes P0051 on a 2014-2021 Mazda Mazda6?
Common causes of P0051 include: Short to ground, Faulty sensor, Corroded connector.