“Choose Your Help Topic Below”
- OBD-I: First Generation On-Board Diagnostics Codes
- OBD-II: Second Generation On-Board Diagnostics Codes
- Dash Warning Lights – Only Provide A Warning Something Is Wrong
- Check Engine Light (CEL) – What Can Cause It To Come On
- OBD Engine Codes and (CEL) Lights – Learn How to Read Them
- Reduced Engine Power Warning Light – What To Do And Why?
Engine codes, or Diagnostic Trouble Codes (DTCs), are how a vehicle’s On-Board Diagnostics (OBD) system communicates problems, with codes like P0420 alerting drivers to specific malfunctions. To understand what the vehicle is telling you, you connect an OBD-II scanner to the port, retrieve the codes, and then look up their meaning online or in a service manual.
While some simple issues, like a loose gas cap, can be fixed by the owner, the codes provide a starting point for more complex diagnostics that often require professional help.
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