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How does the OBDII works?

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The Engine Control Module (ECM) or Powertrain Control Module (PCM) continuously monitors the engine for conditions that can cause an increase on tailpipe emissions. If the ECM or PCM detects a potential problem with the engine, a warning light called a "malfunction indicator light" (MIL) on the dashboard is illuminated to alert the driver of a problem. This light is usually identified by the words "Check Engine," "Service Engine Soon," or the word "Check" along with an engine symbol. The ECM or PCM will also stored a Diagnostic Trouble Code" (DTC) in the computer's memory. This DTC can be retrieved with a code reader device to help diagnose problems with the vehicle.

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Related FAQ

- What is OBDII?
- How does the OBDII works?
- Why is the Engine Light ON?
- Is the OBD system working correctly?
- What does it mean if the Service Engine Soon or Check Engine light is blinking?
- What does it mean if the Service Engine Soon or Check Engine turns on while I'm driving?
- What should I do if the Service Engine Soon or Check Engine light stays on?
- What is Bank 1 and Bank 2?
- What is ECM?
- What is PCM?

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