P0409 Code - Exhaust Gas Recirculation Sensor 'A' Circuit

What Does P0409 Mean?

The PCM has detected a problem with the rate of flow of the exhaust gas recirculation (EGR) system. A trouble code has been stored and a malfunction indicator lamp has been illuminated. Some vehicle models require multiple drive cycles for a malfunction indicator lamp to be illuminated.

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What are the common causes of P0409 ?

• Faulty EGR valve
• Open or short in the wiring harness
• Carbon Buildup on EGR valve
• Failed EGR solenoid or position sensor

How do you troubleshoot P0409 ?

While fuel economy was increased, acceleration was seriously compromised, and the loss of engine vacuum led to a dangerous loss of braking assist when the P0409 code system was in four-cylinder mode. In addition to these issues, while the company proposed a hydraulically controlled system that could be switched from within the car, the version they implemented had to be manually changed in the engine compartment using hand tools.

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