Symptoms
Oil inside the camshaft-adjuster magnet connectors; on neglected engines oil wicks up the harness toward the engine control unit.
The fix, step by step
- Unplug each connector and inspect for oil.
- Replace leaking cam magnets and fit Mercedes’ sacrificial adapter pigtails so any future seepage stops short of the main harness.
- Clean contaminated connectors with electrical cleaner.
Tools & part numbers
- Camshaft-adjuster magnets
- factory sacrificial pigtails
- electrical contact cleaner
- Torx bits
Where to buy the parts
Pierburg camshaft adjuster magnet 272 051 01 77FCP Euro ↗Amazon ↗
Camshaft adjuster magnet repair kit (OE supplier, G 550 2009–2015)FCP Euro ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Mercedes-Benz G 550 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.