Fault code P0262 – a step-by-step guide to diagnosing and fixing it

Error code P0262 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 of the first cylinder, where the electrical circuit has too low a resistance. This DTC P0262 indicates a short circuit or damage to the wiring to the injector. For some manufacturers, this fault code may also be referred to as "Cylinder 1 injector circuit low".

What can cause this error code?

• Defective injector cylinder 1
• Short circuit in the wiring to the injector
• Damaged connector on the injector
• Corroded or loose contacts
• Defective engine control unit (ECU)
• Broken ground wire
• Damaged cable insulation
• Moisture in the connector

What symptoms occur in parallel with fault code P0262?

• Engine running unevenly: The engine runs unevenly and jerks when idling
• Power loss: Noticeable reduction in engine power
• Starting problems: Difficult cold start characteristics
• Increased fuel consumption: Deteriorated fuel consumption values
• Misfiring: Irregular combustion in the first cylinder
• Black smoke: Dark exhaust fumes due to incomplete combustion

How to fix the problem of error code P0262?

• The repair requires a systematic diagnosis of the injection system of the first cylinder.
• Inspection and replacement of the defective injector on the first cylinder with subsequent calibration
• Repair or replacement of the damaged wiring between the ECU and injector with insulation test
• Cleaning the corroded plug connections and applying contact spray
• Replacement of the injector plug if the contacts are irreparably damaged
• Checking and repairing the ground connection of the injection system
• Diagnosis and, if necessary, replacement of the engine control unit in the event of an internal defect