P1161 – BMW DTC

BMW DTC P1161 – Fuel Trim Adaptation Additive High (Bank 2) (M52: Engine Oil Temperature Sensor Circuit)

DTC P1161 meaning on BMW

The DTC P1161 for BMW indicates a Fuel Trim Adaptation Additive High fault in Bank 2, specifically related to the M52 engine oil temperature sensor circuit. This fault code is triggered when the engine control module detects that the fuel trim adaptation additive is higher than the specified limit for Bank 2, which can lead to issues with fuel mixture and engine performance.

BMW DTC P1161 symptoms

Symptoms associated with BMW DTC P1161 may include:

• Check Engine Light (MIL) illuminated
• Reduced engine performance
• Increased fuel consumption
• Rough idling or stalling

BMW DTC P1161 causes

Common causes of BMW DTC P1161 include:

• Faulty engine oil temperature sensor
• Wiring or connection issues in the sensor circuit
• Engine control module (ECM) software glitches

BMW DTC P1161 seriousness

While BMW DTC P1161 may not always result in immediate drivability issues, it can lead to poor engine performance and increased fuel consumption if left unresolved. Ignoring this fault code may also cause long-term damage to engine components.

How to diagnose DTC P1161 on BMW

To diagnose BMW DTC P1161, follow these steps:

1. Use a diagnostic scanner to retrieve the fault code and freeze frame data.
2. Inspect the engine oil temperature sensor and its wiring for any visible damage or corrosion.
3. Check the sensor’s resistance and compare it to specifications.
4. Perform a visual inspection of the sensor circuit for loose connections or shorts.

How to fix DTC P1161 on BMW

To fix BMW DTC P1161, consider the following:

1. Replace the faulty engine oil temperature sensor if it is found to be defective.
2. Repair any damaged wiring or connections in the sensor circuit.
3. Clear the fault code and perform a test drive to verify the repair.

How to erase DTC P1161 on BMW

To erase BMW DTC P1161, you can:

1. Use a diagnostic scanner to clear the fault code after the repair has been completed.
2. Perform a drive cycle to ensure the fault does not return.

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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