2006 f-150 5.4 triton,code Po303 and po316

Question

Should I replace the plug first and see if it corrects it's self or replace the plug and the crankshaft sensor at the same time?

Answer 1

Hi there,

With this code I would actually start by swapping the #3 coil with the one next to it. Then see if the misfire moves with it. If it does, then replace the coil. The coil is the most likely problem here.