Code P0303

Hello,

You have misfire at cylinder 3 refer to fault code p0303,that spark can be the problem, injector or low compression in that cylinder.

use our guide how to repair misfire.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Check for injector pulse.

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Check ignition spark at cylinder 3.

https://www.2carpros.com/articles/how-to-test-an-ignition-system

If you have good blue spark and the injector is good, then you must check the compression of that cylinder and compare with others.

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

Let us know what happens with you.

Thank you.