P0099 – BMW DTC

BMW DTC P0099 – Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic (Bank 1)

DTC P0099 meaning on BMW

DTC P0099 indicates an issue with the Intake Air Temperature Sensor 2 Circuit on Bank 1 in a BMW vehicle. This fault code is triggered when the Engine Control Module (ECM) detects intermittent or erratic signal from the intake air temperature sensor.

BMW DTC P0099 symptoms

Symptoms of DTC P0099 in a BMW may include:

• Check Engine Light illuminated
• Reduced engine performance
• Poor fuel efficiency
• Rough idling or stalling

BMW DTC P0099 causes

Common causes of DTC P0099 on a BMW include:

• Faulty intake air temperature sensor
• Wiring or connector issues in the sensor circuit
• ECM software or hardware problems

BMW DTC P0099 seriousness

While DTC P0099 may not cause immediate drivability issues, it can lead to reduced engine performance and fuel efficiency if left unresolved. It is recommended to address this fault code promptly to prevent further complications.

How to diagnose DTC P0099 on BMW

To diagnose DTC P0099 on a BMW, you can perform the following steps:

1. Use a diagnostic scanner to retrieve the fault code and freeze frame data
2. Inspect the intake air temperature sensor and its wiring for any visible damage
3. Test the sensor’s resistance and voltage output using a multimeter
4. Check for any loose connections or corrosion in the sensor circuit

How to fix DTC P0099 on BMW

To fix DTC P0099 on a BMW, you can try the following solutions:

1. Replace the faulty intake air temperature sensor
2. Repair or replace any damaged wiring or connectors in the sensor circuit
3. Update the ECM software if necessary

How to erase DTC P0099 on BMW

To erase DTC P0099 on a BMW, you can clear the fault code using a diagnostic scanner. After addressing the underlying issue causing the fault code, you can reset the ECM and clear the code to turn off the Check Engine Light.

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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