BMW DTC P1133 – O2 Sensor Heater Control Circuit (Bank 2 Sensor 1)
DTC P1133 meaning on BMW
DTC P1133 on a BMW indicates an issue with the O2 sensor heater control circuit for Bank 2 Sensor 1. This fault code specifically points to a malfunction in the heating element circuit of the oxygen sensor located in the bank 2, which is typically the side of the engine where cylinder 2 is located.
BMW DTC P1133 symptoms
Symptoms of DTC P1133 on a BMW may include poor fuel economy, rough idling, engine misfires, hesitation during acceleration, and an illuminated check engine light on the dashboard. Additionally, the vehicle may fail an emissions test due to increased emissions.
BMW DTC P1133 causes
The common causes of DTC P1133 on a BMW include a faulty O2 sensor heater, damaged wiring or connectors in the sensor circuit, a blown fuse related to the sensor heater, or a problem with the engine control module (ECM) that controls the sensor heater circuit.
BMW DTC P1133 seriousness
While DTC P1133 may not cause immediate drivability issues, it can lead to decreased fuel efficiency and increased emissions. Ignoring this fault code can potentially cause damage to the catalytic converter over time, resulting in more costly repairs.
How to diagnose DTC P1133 on BMW
To diagnose DTC P1133 on a BMW, a mechanic would typically start by using a diagnostic scanner to retrieve the fault code and then inspect the wiring and connectors related to Bank 2 Sensor 1. They may also test the O2 sensor heater for proper resistance and check the fuse associated with the sensor heater circuit.
How to fix DTC P1133 on BMW
Fixing DTC P1133 on a BMW usually involves replacing the faulty O2 sensor heater, repairing any damaged wiring or connectors, replacing a blown fuse if necessary, or addressing any issues with the engine control module. Once the root cause is identified and fixed, the fault code should be cleared.
How to erase DTC P1133 on BMW
To erase DTC P1133 on a BMW, you can use a diagnostic scanner to clear the fault code after the underlying issue has been resolved. This will reset the check engine light and allow the vehicle’s ECM to monitor the system for any new faults.