Service Engine Soon
Using your car's on board diagnostic system


The system returns OBD diagnostic trouble codes beginning with either P0 or P1. The P0 codes are generic, the same for all makes and models of cars. The P1 codes are proprietary, established independently by each automobile manufacturer.

Eqquis Products provides a database of most codes that can be searched.

IMPORTANT: Retrieving and utilizing Diagnostic Trouble Codes (DTC’s) for troubleshooting vehicle operation is only one part of an overall diagnostic strategy. Never replace a part based only on the Diagnostic Trouble Code Definition. Always consult the vehicle’s service manual for more detailed testing instructions. Each DTC has a set of testing procedures, instructions and flow charts that must be followed to confirm the exact location of the problem. This type of information is found in the vehicle’s service manual.

service engine soon, mic light, auto repair, obd II, on board diagnostics,code reader © 2005 Leland R. Beaumont