Cylinder 8 Above Knock/Combustion Vibration Sensor Threshold

Where it lives

For P2343, the description names the sensor as the part involved. The description of P2343 puts it on cylinder 8.

Check these first

• Bad or low-octane fuel feeding cylinder 8
• Carbon deposits glowing on piston 8 or the chamber walls
• Knock sensor signal skewed away from cylinder 8
• Spark plug in cylinder 8 fouled or gapped wrong
• Cracked cylinder head or block near cylinder 8

What to do next

1. Drain and refill with the correct octane fuel
2. Inspect the spark plug in cylinder 8 and set the gap or replace it
3. Scope the knock sensor while tapping near cylinder 8
4. Perform a compression test on cylinder 8
5. Do a carbon clean if deposits are found on the piston
6. Clear the code and retest

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