I have an 03 Ypsilon which is a great little car I laid it up and the battery went flat so I fitted a new one , the only problem is the power surge when I fitted the new Battery caused the ecu to think there was a fault with the engine. the car runs fine but the engine light is on and the dash reads complete engine failure !!
. I brought it to a couple of experts and they said that the ecu was damaged when the new battery was fitted and it would need to replace it . The cost of an ecu is nearly the value of the car , and this is for a re-built one ! Does anybody know anyone who could help with this problem . I am afraid it would fail the NCT Test which is the same as the MOT test only a lot stricter ! Thanks David.