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CEI Vehicle Inspection & OBD Systems Flashcards

6 cards from real CEI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What does OBD-II stand for in the context of vehicle emission inspections?

    Answer: On-Board Diagnostics, second generation

    OBD-II stands for On-Board Diagnostics, second generation, a standardized system required on all US vehicles since 1996 to monitor emission-related components.

  2. Which OBD-II readiness monitor must be in a 'complete' or 'ready' state for a vehicle to pass an emission inspection?

    Answer: All required monitors must show complete or ready

    For a vehicle to pass an OBD-II emission test, all required readiness monitors must be set to complete or ready, indicating the self-tests have run and passed.

  3. What is the maximum number of OBD-II readiness monitors that can be 'not ready' on a 1996–2000 MY vehicle without causing an automatic OBD test failure in most US states?

    Answer: 2 monitors not ready

    For model year 1996–2000 vehicles, most state I/M programs allow up to 2 readiness monitors to be incomplete before the vehicle automatically fails the OBD portion of the test.

  4. A Malfunction Indicator Lamp (MIL) illuminated solid during an OBD-II inspection indicates what?

    Answer: A stored Diagnostic Trouble Code related to an emission system fault

    A solid MIL (Check Engine Light) indicates one or more Diagnostic Trouble Codes (DTCs) are stored, signaling a detected emission-related fault.

  5. Which connector port is used to access OBD-II data during a vehicle emission inspection?

    Answer: DLC (Data Link Connector), a 16-pin J1962 port

    The Data Link Connector (DLC), standardized as a 16-pin J1962 connector, is the interface used to plug in scan tools and access OBD-II data.

  6. What does a 'P0420' diagnostic trouble code indicate on an OBD-II equipped vehicle?

    Answer: Catalyst system efficiency below threshold (Bank 1)

    P0420 is a generic OBD-II code indicating the catalytic converter efficiency on Bank 1 has dropped below the minimum threshold required by the ECU.