My wife owns a A160 1999 model petrol.For a couple of weeks she has had a problem that the throttle has less response.It feels as if the throttle only starts taking at about half way down it's travel.There are no fault codes or warning lights that appears.The car has been regularly serviced etc.During last week I changed the engine oil and filter and pressure washed the engine compartment since then I've had a intermittent power steering problem.At times the steering is normal and suddenly it goes rock hard even while in a corner.Don't really want to take the car to the agents as they charge a arm and a leg for the repairs.Any Information on the diagnostics of this car will be appreciated.