Car had just been filled with petrol.
Car has done about 80k miles but been fine and still running fine, other than this light. Regular services etc- inc. one in Dec.
I can't plug my obd reader just now (the car isn't to hand).
Looking on the 'net, a common (most common?) cause is loose filler cap, so I've told son-in-law to be to check. Light still on.
However, what I'm not sure about, does the light 'self clear' for problems like the filler cap or do I need to reset it?
*I was previously told the 'shudder' was the engine switching into a 'safe mode' by a friendly mechanic.