P1155low severityPowertrain
Air/Fuel Sensor Heater Circuit Bank 1 Sensor 2
on 2012 Toyota Highlander 3.3L V6 Hybrid · AWD
What this code means
Heater circuit fault in the downstream A/F sensor.
Symptoms
- CEL
- Poor cold-start economy
- Increased warm-up emissions
Common causes
- Failed heater element
- Open wiring
- Blown fuse
- Corroded connector
Diagnostic steps
- Test heater resistance
- Check fuse
- Inspect wiring
Repair notes
Replace sensor or repair heater circuit.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
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