P1144 – BMW DTC

BMW DTC P1144 – O2 Sensor Activity Check Signal Too Low (Bank 1 Sensor 2)

DTC P1144 meaning on BMW

The Diagnostic Trouble Code (DTC) P1144 on a BMW indicates that the O2 Sensor Activity Check Signal from Bank 1 Sensor 2 is too low. This means that the signal being received from the downstream oxygen sensor in Bank 1 is not within the expected range, which can affect the engine’s performance and emissions control.

BMW DTC P1144 symptoms

Symptoms of DTC P1144 on a BMW may include:

• Check Engine Light illuminated on the dashboard
• Poor fuel economy
• Rough idling or engine misfires
• Reduced engine performance
• In some cases, there may be no noticeable symptoms

BMW DTC P1144 causes

The common causes of DTC P1144 on a BMW include:

• Faulty downstream oxygen sensor (Bank 1 Sensor 2)
• Wiring or connector issues in the oxygen sensor circuit
• Exhaust leaks near the oxygen sensor
• Engine running too rich or too lean

BMW DTC P1144 seriousness

While DTC P1144 may not always cause immediate drivability issues, it is important to address this code promptly. Ignoring the problem can lead to decreased fuel efficiency, increased emissions, and potential damage to other engine components over time.

How to diagnose DTC P1144 on BMW

To diagnose DTC P1144 on a BMW, you can follow these steps:

1. Use a diagnostic scanner to retrieve the fault codes and identify the specific code P1144.
2. Inspect the wiring and connectors related to Bank 1 Sensor 2 for any visible damage or corrosion.
3. Check for exhaust leaks near the downstream oxygen sensor.
4. Perform a scan tool test to monitor the oxygen sensor’s activity and voltage readings.

How to fix DTC P1144 on BMW

To fix DTC P1144 on a BMW, you can consider the following steps:

1. Replace the downstream oxygen sensor (Bank 1 Sensor 2) if it is found to be faulty.
2. Repair or replace any damaged wiring or connectors in the oxygen sensor circuit.
3. Address any exhaust leaks near the oxygen sensor.
4. Perform a reset of the fault codes and monitor the system for any recurring issues.

How to erase DTC P1144 on BMW

To erase DTC P1144 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the vehicle’s computer. After addressing the underlying issue causing the fault code, clearing the code will reset the Check Engine Light and allow the system to monitor for any new faults.

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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