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A heavy vehicle's engine derates itself and a warning appears after a long journey.

Which cause fits best?

  • A.The carbon canister is saturated
  • B.The compression ratio has fallen
  • C.The urea solution tank has run empty
  • D.The lambda sensor has failed

Answer: C

Modern vehicles derate deliberately to prevent operation without the reduction system's reagent, since the emissions would otherwise rise by a factor of several. A lambda sensor belongs to a petrol engine and has no part here.

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