Fault code P1351 – a step-by-step guide to diagnosing and fixing it

Error code P1351 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in the ignition system, specifically a fault in the ignition coil or the ignition circuit of cylinder 1. This DTC (Diagnostic Trouble Code) indicates problems with the ignition, which can lead to engine misfires and reduced performance.

What causes can this error code have?

• Defective ignition coil on cylinder 1
• Damaged ignition cables or spark plug connectors
• Worn or incorrectly adjusted spark plug
• Loose or corroded plug connections in the ignition circuit
• Defective ignition control unit or PCM
• Short circuit or interruption in the wiring
• Low fuel pressure or clogged injection nozzle
• Mechanical engine problems such as low compression

What symptoms occur in parallel with fault code P1351?

• Engine misfires: Unsteady engine running, especially when idling
• Loss of power: Reduced engine power and poor acceleration
• Increased fuel consumption: Engine runs inefficiently due to ignition problems
• Starting problems: Difficult starting or longer starting times
• Exhaust odor: Unburned fuel due to incomplete combustion
• Check engine light: Permanently lit check engine light

How can I fix the problem with fault code P1351?

• Repairing fault code P1351 requires a systematic approach to identify the exact cause.
• Replace the ignition coil of cylinder 1: Replace the defective ignition coil with a new original coil and check all electrical connections
• Replace spark plug and ignition cable: Replace worn spark plug with suitable replacement plug and completely replace damaged ignition cable
• Repair electrical connections: Clean all plug connections in the ignition circuit, replace corroded contacts and tighten loose connections
• Check and repair wiring: Inspect ignition wiring harness for damage, repair defective wiring or replace complete wiring harness
• Diagnose ignition control unit: Test PCM or ignition module with professional diagnostic software and replace with original spare part if defective
• Check the fuel system: Measure fuel pressure, clean or replace injectors and replace fuel filter