Fault code P0202 – a step-by-step guide to diagnosing and fixing it

Error code P0202 is displayed and the check engine light is on - what does this mean?

The OBD system has detected an error in the injection circuit of cylinder 2. This DTC P0202 indicates a problem with the injection valve, the wiring or the control of the second cylinder. The exact designation may vary for different manufacturers, but the error code always refers to the injection circuit of cylinder 2.

What causes can this error code have?

• Defective injection valve on cylinder 2
• Damaged or corroded wiring to the injector
• Loose or dirty plug connections
• Short circuit in the injection circuit wiring
• Defective engine control unit (ECU)
• Clogged or dirty fuel injector
• Faulty fuel pump or low fuel pressure
• Defective fuel pressure regulator

What symptoms occur in parallel with fault code P0202?

• Engine running unevenly: The engine runs unevenly or jerks, especially when idling
• Loss of power: Noticeable reduction in engine power when accelerating
• Increased fuel consumption: The engine requires more fuel than usual
• Starting problems: The vehicle is difficult to start or starts with a delay
• Exhaust odor: Unburned fuel can be smelled in the exhaust gas
• Misfiring: The engine stops irregularly, especially under load

How can the problem with error code P0202 be rectified?

• Repairing EOBD error code P0202 requires a systematic diagnosis and appropriate measures.
• Replace the injection valve: Replace defective injection valve on cylinder 2 with a new or reconditioned valve, including new seals and proper assembly
• Repair wiring: Locate damaged cables to the injector, replace defective sections and check all connections for corrosion and clean
• Clean plug connections: Disconnect all electrical connections to the injector, clean with contact spray and reconnect firmly
• Flush the fuel system: Have the fuel lines and injectors professionally cleaned to remove blockages and ensure optimum fuel flow
• Check engine control unit: Test ECU for defects and have it repaired or replaced if necessary, including reprogramming
• Check fuel pressure system: Test fuel pump, filter and pressure regulator and replace defective components