What this code means

The DME detected a severe misfire on Cylinder 8 and has activated fuel cut-off. This code is specific to BMW V8 engines (N62, N63, S63, S65). Cylinder 8 misfires on these engines often relate to valve stem seal or VANOS issues.

Symptoms

• Check Engine Light flashing
• Rough running
• Significant power loss
• Exhaust smell of unburned fuel

Common causes

• Faulty ignition coil Cylinder 8
• Worn spark plug Cylinder 8
• Injector failure
• Low compression due to worn valve stem seals
• VANOS unit failure

Diagnostic steps

1. Read misfire counters per cylinder
2. Swap coil from Cylinder 8
3. Inspect spark plug for oil fouling
4. Compression and leak-down test
5. Check VANOS operation

Repair notes

Replace ignition coil or spark plug; check for oil consumption on V8 engines.

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