BMW DTC P21E3 – Cylinder 4 Injector ‘B’ Circuit High
DTC P21E3 meaning on BMW
The DTC P21E3 code on a BMW indicates an issue with the Cylinder 4 Injector ‘B’ Circuit High. This means that the Engine Control Module (ECM) has detected a high voltage condition in the circuit that controls the fuel injector for cylinder 4.
BMW DTC P21E3 symptoms
Symptoms of the BMW DTC P21E3 code may include:
- Check Engine Light illuminated
- Engine misfires
- Reduced engine performance
- Increased fuel consumption
BMW DTC P21E3 causes
Possible causes of the BMW DTC P21E3 code include:
- Faulty fuel injector for cylinder 4
- Wiring or connector issues in the injector circuit
- ECM malfunction
- Injector driver circuit fault
BMW DTC P21E3 seriousness
Ignoring the BMW DTC P21E3 code can lead to potential engine performance issues, increased fuel consumption, and possible damage to the catalytic converter. It is important to address this issue promptly to prevent further damage.
How to diagnose DTC P21E3 on BMW
To diagnose the DTC P21E3 code on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the wiring and connectors in the injector circuit for any damage or corrosion
- Test the fuel injector for cylinder 4 for proper operation
- Check the ECM for any faults or malfunctions
How to fix DTC P21E3 on BMW
To fix the DTC P21E3 code on a BMW, the following steps may be taken:
- Replace the faulty fuel injector for cylinder 4
- Repair any damaged wiring or connectors in the injector circuit
- Address any ECM issues or faults
- Clear the fault codes and perform a test drive to ensure the issue is resolved
How to erase DTC P21E3 on BMW
To erase the DTC P21E3 code on a BMW, a diagnostic scanner can be used to clear the fault codes stored in the ECM. After the codes are cleared, it is recommended to perform a test drive to verify that the issue has been resolved.
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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