Fault code P1302 – a step-by-step guide to diagnosing and fixing it

Error code P1302 is displayed and the check engine light is on - what does this mean?

With this DTC P1302, the OBD/EOBD system detects a malfunction in the ignition system, specifically in the ignition coil or the ignition circuit of cylinder 2. This manufacturer-specific fault code mainly occurs in Ford vehicles and indicates problems with the ignition control of the second cylinder.

What can cause this fault code?

• Defective ignition coil on cylinder 2
• Damaged spark plug in the second cylinder
• Broken or corroded cable connections to the ignition coil
• Faulty spark plug connectors or cables
• Defective engine control unit (PCM/ECM)
• Loose plug connections in the ignition circuit
• Short circuit in the wiring to the ignition coil
• Dirty or damaged spark plug threads
• Incorrect spark plug specification
• Mechanical problems on the cylinder head

What symptoms occur in parallel with fault code P1302?

• Engine running unevenly: The engine runs unevenly and jerks, especially when idling
• Loss of power: Noticeable reduction in engine power while driving
• Misfiring: Clearly perceptible misfiring when accelerating
• Increased fuel consumption: Consumption increases noticeably
• Starting problems: The vehicle is harder to start or takes several attempts
• Check engine light: The warning light lights up permanently or flashes
• Exhaust odor: Unburned fuel can be detected in the exhaust gas

How can the problem with fault code P1302 be rectified?

• Repairing fault code P1302 requires a systematic approach to identify the defective component.
• Replace the ignition coil of cylinder 2 completely, ensuring the correct specification for the vehicle model
• Replace the spark plug of the second cylinder, using the correct electrode gap and heat value
• Check and clean all cable connections to the ignition coil and replace the entire wiring if corroded or damaged
• Test the spark plug connector and ignition cable for continuity and replace the entire ignition cable system if there are resistance deviations
• Check the engine control unit for functionality and replace with a new or overhauled PCM if a defect is confirmed
• Loosen plug connections in the ignition circuit, clean with contact spray and reattach with the prescribed torque