what does a 409 code indicate on a 5.4 triton engine

Asked by Oct 17, 2015 at 04:37 PM about the 2001 Ford F-150

Question type: Maintenance & Repair

2 Answers


EGR (Exhaust Gas Recirculation) circuit "A" fault. If you have no symptoms such as rough idle, won't idle, stalling, or pinging it's going to be the wiring or connector for the EGR valve. If you have symptoms such as what I've mentioned, it's going to be a stuck open EGR valve. HTH. -Jim


could be you DPFE also that's the sensor that has 2 hoses on it that goes to the egr tube

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