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Roger, BMW Master Tech
Category: BMW
Satisfied Customers: 3040
Experience:  10 yrs. experience as BMW Master Technician, shop foreman and dealer.
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I am getting a P0303 code on my 2000 Bmw 328i. I have

Customer Question

I am getting a P0303 code on my 2000 Bmw 328i. I have replaced the #3 ignition coil and the plug as well and still getting the error code P0303. What should I do next?
Submitted: 1 year ago.
Category: BMW
Expert:  Gary replied 1 year ago.

Hi there,

Remove all the spark plugs and conduct a compression test, should be within 10% of each other.

If no abnormality noted, swap the coil from 3 to 4, swap the spark plug from 3 to 2, swap the fuel injector from 3 to 1.

Restart engine and note which cylinder now misfiring.