P0300 mazda6 2005. I don't know why it has it because the car has not lost power.

Question

I have been working on the car, I changed the spark plug wires and it keeps showing the same code.

Answer 1

HI there

This code is for a random cylinder misfire. This can be caused by more then just the plug wires. The computer can't determine which cylinder is causing the issue, so the result is the P0300

Here is a list of some of the other possible causes.

P0300 MAZDA - Random Cylinder Misfire Detected

Read more: https://www.autocodes.com/p0300_mazda.html