BMW DTC P1490 – Exhaust Gas Temperature Sensor ‘A’ Electrical
DTC P1490 meaning on BMW
The DTC P1490 code on a BMW indicates a fault with the Exhaust Gas Temperature (EGT) Sensor ‘A’ electrical circuit. This sensor is responsible for monitoring the temperature of the exhaust gases leaving the engine.
BMW DTC P1490 symptoms
Common symptoms associated with DTC P1490 on a BMW may include:
- Check Engine Light illuminated on the dashboard
- Reduced engine performance or power
- Increased fuel consumption
- Engine running rough or misfiring
BMW DTC P1490 causes
The DTC P1490 code on a BMW can be triggered by various factors, including:
- Faulty Exhaust Gas Temperature Sensor ‘A’
- Wiring or connector issues in the EGT sensor circuit
- ECU (Engine Control Unit) malfunction
BMW DTC P1490 seriousness
While the DTC P1490 code may not cause immediate drivability issues, it is important to address the underlying problem to prevent potential damage to the engine or emissions system. Ignoring this fault could lead to increased fuel consumption and emissions, as well as potential engine performance issues.
How to diagnose DTC P1490 on BMW
To diagnose DTC P1490 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the wiring and connectors related to the EGT sensor
- Test the EGT sensor for proper operation
- Check the ECU for any stored fault codes or issues
How to fix DTC P1490 on BMW
To fix DTC P1490 on a BMW, the following steps may be taken:
- Replace the faulty Exhaust Gas Temperature Sensor ‘A’
- Repair any damaged wiring or connectors in the EGT sensor circuit
- If necessary, reprogram or replace the ECU
How to erase DTC P1490 on BMW
After addressing the underlying issue causing the DTC P1490 code on a BMW, the code can be cleared using a diagnostic scanner. This will reset the Check Engine Light and allow the vehicle’s ECU to monitor the system 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
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.