Code P303 misfiring and engine light is on

SPLAY123

MEMBER
2008 SEAT IBIZA
1.2L
3 CYL
FWD
MANUAL
55,000 MILES

I have a reoccurring problem with my engine light appearing causing my car to lack in power, misfire continuously and eventually causes my car to come to a complete stop. I then turn off the car turn it back on. The engine light goes and car works okay with a slight misfire.I diagnosed my car finding P303-cylinder three misfire. Changed all the spark plugs and the cylinder three ignition coil. I am still getting the engine light coming on and causing my car to run really bad whilst the engine light is on, but when I turn off the car and back on the engine light goes and the car runs fine with a slight misfire. Can you please help me?

1 Reply

STEVE W.

MECHANIC
13,573 POSTS

Do not have any information on that vehicle, but I would see if you can swap the fuel injector from one of the other cylinders and see if the mis follows it. If it does you have a bad injector.
If not then you will want to try a compression test to make sure it is not something in the engine mechanically wrong.

https://www.2carpros.com/articles/how-to-test-engine-compression