Symptoms
Oil inside the four camshaft-adjuster magnet connectors at the front of the heads. Possible cam-timing codes. On neglected engines, oil wicks along the harness toward the engine computer.
The fix, step by step
- Replace all four magnets.
- Fit sacrificial wiring pigtails so any future leak stops at a cheap connector.
- Clean the harness plugs with electronic cleaner and check the far end of the harness for oil.
- FCP Euro's kit is built for this job on the M157, M278 and related engines.
Tools & part numbers
- Torx bits
- electrical contact cleaner
- rags
- magnets and pigtails
Where to buy the parts
Camshaft adjuster magnet kit 276 156 07 90 (×4, 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 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.