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Hi there I have noticed my emission light has come on, drives absolutely fine, no sluggishness or anything. When I jiggle some wires, the ones under the vent bit at top of engine bay, the light goes out for a day or 2 but just comes back on, what could this be?
 

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I don't know what the "emissions light" is on a corsa C - my experience is of corsa B's which don't have specific emissions lights.

Blowing exhaust could affect emissions. depends where it is blowing. If upstream of the O2 sensor then the sensor reading could be inaccurate causing uour warning light.

Alternatively I would trace the wires you "giggle" to see what they attach to. It could be the wires themselves with a break, short or poor connection. Or it could be the sensor they come from.
 
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