Engine Pre-Ignition Above Threshold

Check these first

• A spark plug with the wrong heat range
• Carbon buildup on the pistons raising compression
• Low octane fuel or the wrong fuel in the tank
• An engine running hot
• A failed knock sensor letting pre-ignition go unchecked

What to do next

1. Check the spark plugs for the correct heat range
2. Inspect the cylinders for carbon buildup
3. Verify the fuel octane and quality
4. Check the coolant temperature and cooling system
5. Test the knock sensor circuit
6. Clear the code and retest

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