Codici errore OBD2 e spia motore: approccio pratico

The check engine light (CEL) means your car stored at least one diagnostic trouble code (DTC). Generic OBD2 codes start with P0xxx (powertrain), while manufacturer-specific codes often use other prefixes once a compatible scan tool decodes them.

A practical workflow: scan with an ELM327 adapter, note pending vs stored codes, read freeze frame data if available, then clear codes only after you understand the fault and have fixed the root cause.

Common families include misfires (P03xx), fuel trim and oxygen sensors (P01xx/P02xx), and catalyst efficiency (e.g. P0420/P0430). Always verify symptoms and live data before replacing expensive parts.

Use an AI-assisted OBD2 app if you want plain-language explanations and next diagnostic steps alongside raw codes.