Fault code P0205 – a step-by-step guide to diagnosing and fixing it

Error code P0205 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in the injection valve circuit of the 5th cylinder. This DTC P0205 indicates a problem with the electrical connection or the injection valve itself. The fault description may vary slightly for different manufacturers, but always refers to the 5th cylinder.

What causes can this error code have?

• Defective injection valve on the 5th cylinder
• Damaged or corroded cable to the injection valve
• Loose or corroded plug connections
• Defective engine control unit output stage
• Short circuit in the wiring
• Interrupted circuit to the injection valve
• Defective fuse in the injection system
• Faulty earth connection

What symptoms occur in parallel with fault code P0205?

• Engine running unevenly: The engine runs unevenly, especially when idling
• Loss of power: Noticeable reduction in engine power
• Increased fuel consumption: The engine runs inefficiently
• Starting problems: Difficulty starting, especially when the engine is cold
• Exhaust problems: Increased emissions and black smoke
• Misfiring: Jerking and irregular engine running

How to fix the problem of error code P0205?

• The repair requires a systematic diagnosis of the electrical components of the injection system.
• Replacement of the defective injection valve on the 5th cylinder after prior resistance measurement
• Repair or replace damaged cables between the engine control unit and injection valve
• Cleaning and securing all plug connections in the injection valve circuit
• Replacement of the defective engine control unit output stage by a specialist workshop
• Elimination of short circuits through complete wiring check and insulation repair
• Replacing blown fuses and checking the cause
• Repair of the earth connections and cleaning of the earth points