Hi all
I've got a ford focus 2014, 1.0 ecoboost, coming up with fault p0303 misfire detected running rough changed coil pack, plug still same even swapped coil packs and plugs, still with fault p0303p but have notice under acceleration I can only describe as a knock, I'm thinking along lines of an injector?? Anybody got any thoughts

 

Have you tried googling the fault code??

 

303 is cylinder 3 misfire, can be caused by an injector if plugs and coils have been changed/substitutted.

• Or worse case a base engine fault (piston failure)