Mazda B3000 code P0303, check engine light is on.

Question

I changed spark plug and still get flashing check engine light. It won't go over 3000 rpm and 40 kmh.

Answer 1

Hi there

This code can still be the result of a bad ignition coil or injector. I would try swapping the coil with the one next to it. If it's the older style coil with plug wires, then replace the coil and wires. If that doesn't resolve the issue then do a compression test on cylinder #3.