![]() How does a mechanic diagnose the P0409 code? In some cases no adverse symptoms are noticed other than the Check Engine Light. The vehicle may experience a lack of power and a ping noise under heavy use. In all cases the Check Engine Light will be seen on the dashboard. This causes a Check Engine Light to be shown on the dashboard. Low voltage from sensor A is detected by the ECU. ![]() The P0409 code is set when there is a malfunction in the exhaust gas recirculation sensor A circuit. This code may be seen with other EGR codes. P0409 is a generic OBD2 diagnostic trouble code pointing to an issue with the exhaust gas recirculation circuit.
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