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Which lock prevents the steering being turned when parked?

  • A.A ratchet on the pinion
  • B.An electronic immobiliser, which prevents the electric power steering motor from operating when the vehicle is locked
  • C.A bolt engaging a slot in the column
  • D.A hydraulic valve within the steering rack, which is closed when the ignition is switched off and locks the rack

Answer: C

A spring loaded bolt operated by the ignition switch engages a slot in the column shaft, locking the steering. Electronic locks operated by the immobiliser have replaced it on many vehicles. The lock is a legally required security feature. The order in which the effects act is what decides the outcome, so it is worth establishing first. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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