Vauxhall Astra 16valve sxi o4 plate - Engine management light stays on - willie55

Car starts no problem at all but engine management light stays on and while driving car tends to misfire, not badly but enough for car to like stutter , have changed plugs,air filter still same, have you any ideas please and thank you

Vauxhall Astra 16valve sxi o4 plate - Engine management light stays on - Simon

You need to get the code read, if you want pointing in the right direction. Throwing parts at it when you can follow the diagnostic code is daft as the rough running could be quite a few different things on this engine.

Vauxhall Astra 16valve sxi o4 plate - Engine management light stays on - willie55

have had the codes read and the codes are as follows :- PO300, PO301, PO302, PO304 I have been told that PO300 means Random/ Multiple Cylinder Misfire Detecteced Cylinder 1 Misfire, Cylinder 2 Misfire, Cylinder 4 Misfire Can understand the messages but do not know the cause Please can you help. Thank You