Today we’ll be changing the spark plugs on a W203 C200 Mercedes-Benz C-Class. Changing spark plugs in this vehicle is a very simple process, if not easier than an oil change.
- Socket Set
- E8 Torx Socket
- Spark Plug Socket
- Torque Wrench
- x4 Replacement spark plugs (We used Denso IKH20TT)
- Aluminium grade anti-sieze
- Dielectric grease
As required you may need to unplug the coil pack or unplug neighbouring looms. Don’t forget to reconnect these later on.
We will now remove the spark plugs. Push the spark plug socket firmly onto the spark plug to engage it. Using an extension bar and ratchet, remove the spark plug.
Here we have a comparison between the new and old spark plugs. The old spark plug travelled 60,000km.
It’s time to install the new spark plug. Apply even coverage of aluminium grade anti-seize and insert the spark plug into the engine. Engage the threads by hand to ensure they are not cross threaded.
Apply a small amount of dielectric grease into the coil pack and spread onto the metal terminal with a toothpick.
Reinstall the coil packs and hand tighten the bolts. You may feel some resistance when reinstalling, this is normal.
Reconnect any looms you disconnected and reinstall the engine cover. Start the engine and listen for correct operation.