Hello guys,

I need some help finding why my Cadillac Deville has a flashing ses light and also is misfiring.I have replaced all the spark plugs and both ignition coils front and back.Could a oxygen sensor cause this problem?Could this abs code cause this problem abs c1218?I would really appreciate any help about other things to check.The ses light only starts flashing when I got over 20 mph...when idling it does not flash...

Thanks

 

Hope this helps:

Possible causes - Faulty spark plug (s) - Faulty ignition coil (s) - Clogged or faulty fuel injector (s) - Intake air leak - Fuel injectors harness is open or shorted - Fuel Injectors circuit poor electrical connection - Ignition coils harness is open or shorted - Ignition coils circuit poor electrical connection - Insufficient cylinders compression - Incorrect fuel pressure

Read more: P0300 Cadillac Cylinder Misfire Detected Random Cylinders OBDII Engine Light Trouble Code | Engine-Codes.com