P0205 Mercedes-Benz Code - Injector Circuit/Open Cylinder 5

P0205 indicates an issue with the injector circuit for cylinder 5, such as an open circuit or electrical fault.

Common symptoms include rough idling, misfiring, reduced engine performance, poor fuel economy, and possibly an illuminated check engine light.

Potential causes include a faulty fuel injector, damaged wiring or connectors in the injector circuit, a malfunctioning engine control module (ECM), or corrosion in the electrical connections.

Driving with a P0205 code is not recommended as it can cause engine misfires, reduced performance, and potential long-term damage to the engine or catalytic converter.

Diagnosis involves inspecting the wiring and connectors for damage, testing the fuel injector for proper operation, and checking the ECM for faults.

Repairs may include replacing the fuel injector, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming/replacing the ECM.

You’ll need an OBDII scanner, a multimeter for electrical testing, and potentially a noid light to test the injector circuit.

A dirty injector is unlikely to cause this specific code, as P0205 typically points to an electrical or circuit issue, rather than a clog or blockage.

Repair costs vary, but replacing a fuel injector typically costs between $150 and $400, while fixing wiring issues may range from $50 to $200.

Clearing the code may turn off the check engine light temporarily, but the underlying problem must be fixed to prevent the code from returning.