T509 speedy engine management light

evening guys , just took my speedy for its first ( and last by me ! ) jet wash .
Now the engine management light is on . It's been a couple hours since the wash and just tried it again and it's still on .
Apart from not wanting to start straight away , it rode as normal , then halfway home the light came on . I haven't ridden it in the rain yet so have no idea of how well it starts if it's damp normally .
Is this going to be a trip to the dealers or is likely to be something simple ?
Thanks in advance .

 

I'll try her again in the morning . Fingers crossed .

 

Took her out for a ride after work . Light still on .
Disconnected the battery in the hope that that would reset it . Nope.
Any other suggestions guys .

 

Just got back from a ride . The light has gone out . Yay !!!

 

update.
took her for a ride after work and after 10 miles or so she died.
turns over but won't fire .
Not sure if its related or not. The light wasn't on prior to this .
Anyway , called the recovery and shes now at home . Will get her into the garage this week . Hopefully it'll be something no too costly!