they changed the knock sensor and replaced. I had the same issue in august brought it back, they had the car for four Whole days to tell me knock sensor again! Changed it, same problem, I paid both times, then, they have the nerve to refer me to a main dealer! Paid them over £ 200 for nothing!
This comment has an official response:we did changed 2 knock sensors on his car, which was diagnosed in scanner, computer diagnostics is very deceiving some times, about which we informed the customer, after he wrote us about the problem again, we refunded full amount, and top of that we gave him free MOT worth £54.85, because of inconvenience he went through.
Its appalling to leave these remarks after all that.(his refund sign can be provided)
From: sadiq warsi