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A vehicle's evaporative emissions rise sharply after a fuel system repair.

What should be checked first?

  • A.The urea injector
  • B.The carbon canister and its purge and vent connections
  • C.The particulate filter
  • D.The exhaust gas recirculation valve

Answer: B

Vapour lines are easily left disconnected or misrouted during a repair, and the canister then vents directly to atmosphere. Evaporative emissions can rival exhaust hydrocarbons in total, so the fault is far from trivial.

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