when i turn my car over in the morn and it starts it revs to 2000rpms as per normal then i get out and clean the car off, and when i get back in the engine light is on, so i turn off the car then turn it back on and the light dosent come back on, if it dosent come on when idling on the spot it will come on after being moved for like a few seconds again i solve it by turnin the car off then back on again, whats causing the light to come on? it only happens after a really cold night or windy day, a sensor somewhere maybe? 1.8 sohc 290 000kms thanks!

 

sounds like an O2 sensor. code 15