BMW DTC P104E – Turbocharger Air Temperature Sensor 1 Circuit High or Open
DTC P104E meaning on BMW
DTC P104E is a diagnostic trouble code that indicates an issue with the Turbocharger Air Temperature Sensor 1 Circuit being high or open in a BMW vehicle. This sensor is responsible for monitoring the temperature of the air entering the turbocharger, providing crucial data for the engine control unit to optimize performance and fuel efficiency.
BMW DTC P104E symptoms
Symptoms of DTC P104E in a BMW may include reduced engine performance, decreased fuel efficiency, rough idling, and potentially an illuminated check engine light on the dashboard. The vehicle may also go into a reduced power mode to prevent further damage.
BMW DTC P104E causes
The most common causes of DTC P104E in a BMW are a faulty Turbocharger Air Temperature Sensor, damaged wiring or connectors in the sensor circuit, or a malfunctioning engine control unit. Environmental factors such as extreme temperatures or moisture can also contribute to this issue.
BMW DTC P104E seriousness
While DTC P104E may not cause immediate harm to the vehicle, it can lead to decreased engine performance and fuel efficiency if left unresolved. Ignoring this issue may also result in further damage to the turbocharger system over time, potentially leading to costly repairs.
How to diagnose DTC P104E on BMW
To diagnose DTC P104E on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the trouble codes stored in the vehicle’s engine control unit. They would then inspect the Turbocharger Air Temperature Sensor and its wiring for any visible damage or corrosion. Testing the sensor’s resistance and voltage output may also be necessary to pinpoint the issue accurately.
How to fix DTC P104E on BMW
Fixing DTC P104E on a BMW usually involves replacing the Turbocharger Air Temperature Sensor if it is found to be faulty. Additionally, repairing any damaged wiring or connectors in the sensor circuit is essential to ensure proper functionality. In some cases, reprogramming or replacing the engine control unit may be necessary to resolve the issue completely.
How to erase DTC P104E on BMW
Once the underlying issue causing DTC P104E has been fixed, the trouble code can be erased using a diagnostic scanner. By clearing the code, the check engine light should turn off, indicating that the problem has been resolved. It is important to ensure that the repair has been successful before clearing the code to prevent it from reoccurring.
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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