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Heavy Duty Equipment Technician Red Seal Exam Prep · Question

Which warning lamp illuminating on a diesel engine dashboard universally indicates a critical issue requiring immediate attention?

The 'Check Engine' or Malfunction Indicator Lamp signifies that the engine's computer has detected a fault in an emissions-related system or a performance-affec

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Question: Which warning lamp illuminating on a diesel engine dashboard universally indicates a critical issue requiring immediate attention?

Answer options:

  • High beam indicator ✅ Check engine light (Malfunction Indicator Lamp)
  • Fuel level low
  • Windshield washer fluid low

Correct answer: Check engine light (Malfunction Indicator Lamp)

Explanation: The 'Check Engine' or Malfunction Indicator Lamp signifies that the engine's computer has detected a fault in an emissions-related system or a performance-affecting component, often requiring prompt diagnosis.

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