[e90.ayden]

Hey guys, I have a n52 06 325xi. When i got into the car today leaving the grocery store i immediately noticed a misfire and it sounded very bad. Rpms jumping, car shaking, the exhaust sounded like bubbles coming out. i pulled over to scan the car and got codes like 29cf 29d9 P0303. I replaced the coil and spark plugs, still nothing, this is my only car right now and I can’t figure out what is causing this issue if you guys could help me figure out i’d appreciate it,
Thank you,
Ayden

[Joe_in_WLA]

Unless you replaced the wrong coil and spark plug, other issues could be

-Fuel injector
-Wiring harness damage
-Cylinder compression

[lookalikehuuh]

Another question is where did you source the coil pack from? I would have tried to swap the coil pack with another cylinder that isn't misfiring like Cyl 1.

I have seen local auto parts coil pack be bad right from the start.

[Cloverdale]

I've moved injector and had misfire follow to verify my misfire source. Replaced with a used series 9 and been non problematic for years (with mods).