OBD-System: OBD and exhaust gas return system

The on-board diagnostics shows a fault in the exhaust gas recirculation system, but what does the displayed diagnostic trouble code mean? Here, you will find out the meaning behind the diagnostic trouble codes P0400, P0401, P0402, P0403, P0404, P0405, P0406, P0407 and P0408 and what you can do to resolve the issue.

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