P1133moderate severityPowertrain
Air/Fuel Sensor Circuit Response Bank 1 Sensor 1
on 2012 Toyota Highlander 3.5L V6 · AWD
What this code means
The A/F sensor Bank 1 Sensor 1 is responding too slowly to exhaust changes.
Symptoms
- CEL
- Poor fuel economy
- Rough idle
- Increased emissions
Common causes
- Aging sensor
- Contaminated sensor
- Exhaust leak
- Fuel issues
Diagnostic steps
- Monitor sensor response time
- Check exhaust for leaks
- Test sensor heater
- Compare to specs
Repair notes
Replace A/F ratio sensor.
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