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Questions › Safe and Responsible Driving › Question 117 of 418

What does blue smoke coming from the vehicle’s exhaust generally mean?

  1. A.The engine is overheating.
  2. B.The air filter needs to be replaced.
  3. C.The engine is burning oil.
  4. D.The catalytic converter is worn out.
Show answer & explanation

Correct answer: C. The engine is burning oil.

A vehicle can give off blue smoke from the exhaust when it is burning oil. Poor maintenance and worn engines are typical causes. This blue smoke is harmful to the environment and may be costly. Drivers should have the vehicle checked by a competent person.

This is an official-style question from the Safe and Responsible Driving topic of the Ireland driver theory test (Cat. B). Practise all 804 questions free on iTest.ie — with timed mock exams, automatic mistake tracking and progress sync across devices.

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