P0133
O2 Sensor Circuit Slow Response Bank 1 Sensor 1
2014-2021 Mazda Mazda6 2.5L I4
Moderate SeverityPowertrainGeneric (SAE)
Description
The upstream O2 sensor on Bank 1 is responding too slowly to fuel mixture changes.
Symptoms
- Check Engine Light
- Poor fuel economy
- Failed emissions test
- Slight hesitation
Common Causes
- Aging O2 sensor
- Contaminated sensor (oil/coolant/fuel additives)
- Exhaust leak
- Wiring issue
Diagnostic Steps
- Monitor O2 sensor switching frequency (should be >6 switches in 10 sec)
- Check for exhaust leaks
- Inspect sensor for contamination
- Test response to induced rich/lean
Repair Notes
Replace O2 sensor. This is a common wear item.
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
P0133 on Other Vehicles
Common Questions
What does code P0133 mean on a 2014-2021 Mazda Mazda6?
P0133 stands for "O2 Sensor Circuit Slow Response Bank 1 Sensor 1". The upstream O2 sensor on Bank 1 is responding too slowly to fuel mixture changes.
What are the symptoms of P0133 on a Mazda Mazda6?
Common symptoms of P0133 include: Check Engine Light, Poor fuel economy, Failed emissions test, Slight hesitation.
What causes P0133 on a 2014-2021 Mazda Mazda6?
Common causes of P0133 include: Aging O2 sensor, Contaminated sensor (oil/coolant/fuel additives), Exhaust leak, Wiring issue.