BMW DTC P046B – Catalyst Temperature Sensor 1/2 Correlation (Bank 2)
DTC P046B meaning on BMW
The Diagnostic Trouble Code (DTC) P046B for BMW indicates a Catalyst Temperature Sensor 1/2 Correlation issue on Bank 2. This means that there is a discrepancy between the readings of the two temperature sensors located in the catalytic converter system on Bank 2 of the vehicle.
BMW DTC P046B symptoms
Symptoms of the BMW DTC P046B may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Reduced engine performance or power
- Increased fuel consumption
- Engine running rough or misfiring
BMW DTC P046B causes
Common causes of the BMW DTC P046B include:
- Faulty Catalyst Temperature Sensor 1 or 2
- Wiring or connector issues in the sensor circuit
- Exhaust leaks near the sensors
- Problems with the catalytic converter itself
BMW DTC P046B seriousness
The DTC P046B on a BMW should not be ignored as it can lead to decreased engine performance and potentially cause damage to the catalytic converter. It is recommended to address this issue promptly to prevent further complications.
How to diagnose DTC P046B on BMW
To diagnose the DTC P046B on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the wiring and connectors of the Catalyst Temperature Sensors
- Check for exhaust leaks near the sensors
- Test the sensors for proper resistance and voltage readings
How to fix DTC P046B on BMW
To fix the DTC P046B on a BMW, the following steps may be taken:
- Replace the faulty Catalyst Temperature Sensor 1 or 2
- Repair any damaged wiring or connectors in the sensor circuit
- Address any exhaust leaks near the sensors
- If necessary, replace the catalytic converter
How to erase DTC P046B on BMW
To erase the DTC P046B on a BMW, the fault codes can be cleared using a diagnostic scanner. After the issue has been addressed and fixed, the codes can be reset to turn off the Check Engine Light and ensure that the problem has been resolved.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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