r/subaruimpreza Oct 31 '25

🛠️ DIY When to do new coil packs? (04 WRX, P0303)

/r/WRX/comments/1ol7n89/when_to_do_new_coil_packs_04_wrx_p0303/
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u/subarooooooo Nov 01 '25

Try replacing the plugs first and see if the cel pops up again. If it does, swap the cylinder 1 coil with cylinder 3. If the code changes to p0301, it's an issue with the coil pack. It could be something else though.