P0303
Thread Starter
Joined: Jul 2006
Posts: 250
Likes: 9
From: Morris County, N.J.
P0303
Hi all. I have a 2010 TL FWD. Last week I got a check engine light on with code P-0303. Decided to change all six plugs & #3 cylinder coil pack this past weekend. Cleared the codes and she was fine till today. Check engine light back on with same code. Any ideas? This happen to anyone else? BTW plugs looked fine
Senior Moderator
Joined: Apr 2010
Posts: 48,312
Likes: 9,177
From: SoCal, CA
Swap coil packs (e.g. 3 and 2 ) and clear code to see if it follows and if so, bad coil pack. If it doesn’t. Might be a valve issue or the injector is clogged (less likely)
a valve adjustment may help if the former
a valve adjustment may help if the former
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