Category: P0400 à P0499

Learn about DTC P0400: Exhaust Gas Recirculation flow malfunction. Discover causes, symptoms, and fixes for EGR system issues to reduce NOx emissions and res…

Understand P0401 EGR flow issues: symptoms, causes, and repair steps for this exhaust gas recirculation system trouble code in OBD-II vehicles.

Diagnose P0402 code: Excessive EGR flow detected. Learn causes, symptoms, and fixes for your vehicles exhaust gas recirculation system issues.

Learn about P0403 EGR circuit malfunction: symptoms, causes, and fixes for reduced emissions and improved engine performance. Expert diagnostic guide.

Learn about P0404 EGR circuit malfunctions: symptoms, causes, and repair solutions for reduced emissions and improved engine performance.

Troubleshoot P0405 EGR sensor circuit low voltage with expert diagnostics. Learn EGR system functions, common causes…

Learn the meaning, causes, and solutions for the P0406 code related to your vehicles EGR sensor A high circuit.

Learn about P0407 code: Low EGR sensor circuit issues in your vehicles exhaust system.

Learn the causes and solutions for P0408 code: EGR valve circuit B malfunction. Fix electrical issues in your EGR system to reduce emissions and restore engi…

Troubleshoot P0409 code: EGR sensor circuit issues affecting engine performance. Learn symptoms, causes…