CEI CEI Vehicle Inspection & OBD Systems

Question 1

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

Accepted Answer

On-Board Diagnostics, second generation

Answer

Output-Based Detection, version 2

Answer

Onsite Breakdown Detection, second edition

Answer

Optional Board Data, second generation

Question 2

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

Accepted Answer

All required monitors must show complete or ready

Answer

Only the catalyst monitor needs to be ready

Answer

Only the oxygen sensor monitor needs to be ready

Answer

At least one monitor must show complete

Question 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?

Accepted Answer

2 monitors not ready

Answer

1 monitor not ready

Answer

3 monitors not ready

Answer

0 monitors not ready

Question 4

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

Accepted Answer

A stored Diagnostic Trouble Code related to an emission system fault

Answer

The vehicle's battery is low

Answer

The vehicle passed the emission test

Answer

A temporary sensor glitch with no fault code stored

Question 5

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

Accepted Answer

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

Answer

OBD port, a 9-pin RS-232 connector

Answer

ELD port, a 6-pin diagnostic connector

Answer

CAN bus port, a 4-pin OBDII adapter

Question 6

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

Accepted Answer

Catalyst system efficiency below threshold (Bank 1)

Answer

Oxygen sensor circuit malfunction (Bank 1, Sensor 1)

Answer

Evaporative emission control system leak detected

Answer

Mass air flow sensor circuit range/performance problem