Hi,
I recently changed all the plugs in my sl 500...

I changed the 8 on the left side, started the engine, and everything was fine, no notices etc, however I then changed the 8 on the other side, started the engine and it's now coming up with 'visit workshop' in red :S.

Engine starts fine and feels fine to drive...

Could I have not put one of the connectors back on the spark plugs properly? Does anyone have any tips for getting these on and off easier? theyre hard to pop on!

Thanks for any help in advance