P2D0F

Engine Pre-Ignition Above Threshold

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$6–111 (est.)

Symptoms

Metallic knocking sound when the engine is running
Reduced engine power
Increased fuel consumption
Engine overheating
Unstable idling

Causes

Low octane fuel
Engine overheating
Cooling system malfunction
Carbon deposits in the combustion chamber
Knock sensor malfunction

How to Fix

Fill with high-quality fuel with the correct octane number
Check and eliminate engine overheating
Clean the combustion chamber from carbon deposits
Check the operation of the knock sensor
Update ECU firmware (if available)

Related codes

P0325 P0326 P0327