Volvo 2002 v40 turbo
 

My v40 have a c.e.l. I scanned it today and i got a p0303 fault code.
Does any body knows how to fix this?
Your help will be appreciated.
Thank you.
Hector.

Enter the fault code into search.
You'll get numerous recent and possibly relevant posts relating to misfiring and what to check for.
Some relate specifically to S40/V40's.