Symptoms
Misfires, rough idle, oil in the cam-adjuster magnet connectors.
The fix, step by step
- Replace all eight plugs and check the coils, as on a G 63.
- If you find oil in the cam-magnet connectors, fit new magnets with sacrificial pigtails and clean the harness.
Tools & part numbers
- Spark plug socket and extensions
- torque wrench
- contact cleaner
Where to buy the parts
Genuine Mercedes spark plug kit 004 159 81 03 (×8, listed 2013–18 G63)FCP Euro ↗Amazon ↗
Bosch ignition coil kit 276 906 05 01 (×8, listed 2013–18 G63)FCP Euro ↗Amazon ↗
Cam magnet + sacrificial pigtail harness-protection kit (M157/M278)FCP Euro ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Mercedes-Benz G 63 AMG 6×6 parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.