05-01-2014, 11:42 AM
I'd say its the sensor at fault - motor or relays can only cause juddering or non-parking, sounds like your motor could do with a clean if it occasionally judders but that's not the main issue here.
Have you had a new windscreen recently? Sometimes the sensors don't get seated properly when screens are changed.
Have you had a new windscreen recently? Sometimes the sensors don't get seated properly when screens are changed.