i had a problem with my s2 over fueling and couldnt find the problem after months of heart ache and problem solving i finally found out what it was as per usual it was a damn plastic plug which goes on the back of the inlet manifold to let the engine know what temp is outside this was snapped in half making the engine think it was running -28oc and no this is fixed it goes like a dream again well happy now many thanks to all who helped out with this problem of mine

 

Glad to hear you've fixed it but im sorry to say there is no such sensor to tell the engine the outside temperature.

And theres a possibility you could be talking about ACT sensor but thats not down the back of the inlet manifold.............