Welcome to JA.
Does your check engine light flash?
Have you recieved my response?
What type of engine?
I am going to swtich this to a regular q and a since you arent getting a response. Thanks
1.8 l petrol
When the check engine light flashes that indicates a catalyst damaging misfire. So you will need to have the fault codes checked to see what is causing the check engine light to come on. It could be a ignition problem or a head gasket leak getting coolant into a cylinder. So when you figure out what cylinder is causing this you can then proceed with the diag.