What the Latest Mercedes-AMG Spark Plug and Coil Update Means for Your Car

If you drive a Mercedes-AMG with the M177 engine—found in models like the C63, E63, and GT—you may have heard about updated spark plugs and ignition coils with the latest OEM part numbers. Here’s the simple truth: these parts are what make your engine fire properly. Over time, plugs wear and coils weaken, leading to rough idling, hesitation under acceleration, or even a check-engine light.

The updated parts improve reliability and performance, especially under hard driving.

At Boca Auto Care, we see this most often in high-performance European cars, but the principle applies across the board. Whether you drive a BMW, Audi, Porsche, VW, Volvo, Jaguar, Lexus, Toyota, or Honda (including hybrids), keeping your ignition system in good shape is key to smooth starts and good fuel economy.

For hybrid owners, worn plugs can also affect how smoothly the gas engine kicks in and out.

If you’ve noticed any hesitation or a drop in power, it’s worth having a trusted technician take a look. We’re happy to inspect your car and let you know if the plugs or coils need attention—no pressure, just honest advice. Stop by our shop in Boca Raton; we’ve been keeping European and Japanese cars running right since 1989.