What does D mean on Ford F250 ignition coil?
What does D mean on Ford F250 ignition coil? Which means that plugs, plug wires (if so equipped) or the spark plug itself is causing your F250 to throw P0354. Ignition Coil “D” indicates the problem is in the fourth cylinder. You’ll need to look up which cylinder is number four on your engine. How to test Ford 4.6L coil on plug ignition? If you've been wondering how to test the Coil-On-Plug ignition coils on your Ford car or truck (with a 4.6L or 5.4L V8) to see if one or several are bad and are causing a misfire, this...