P0051low severityPowertrain
HO2S Heater Control Circuit Low Bank 2 Sensor 1
on 2009 Subaru Forester 2.5L H4 · AWD
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.
Other Powertrain codes on this vehicle
P0001
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P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
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P0004
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P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1