Symptoms
Misfire codes, rough idle, hesitation under load. Plugs are a scheduled item; coils fail individually.
The fix, step by step
- Remove the engine covers, unplug and pull each coil, and replace the plugs with the correct Mercedes-spec part, torqued to spec.
- Swap any coil that misfire data points to — or move coils between cylinders to confirm before buying.
Tools & part numbers
- Mercedes-spec spark plugs
- ignition coil(s) as needed
- thin-wall spark-plug socket and extensions
- torque wrench
- scan tool
Where to buy the parts
Genuine Mercedes spark plug 000 159 05 00 (M176)FCP Euro ↗Amazon ↗
Genuine Mercedes ignition coil 177 906 02 06 (M176)FCP Euro ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Mercedes-Benz G 500 4×4² 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.