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P0400 Diagnostic Trouble Code Discussion for February 2013

Exhaust Gas Recirculation System Flow Malfunction

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Trouble Ticket Help Requests for DTC P0400
Help Request Posted
2002 Jaguar XKR 4.0L MIL Lamp on VIN: SAJDA42B42
P0400: Egr flow. This egr code resets after only a short road test. We replaced the egr valve and inspected the egr tube for cracks. We can not find the parameters for setting this code. I am assuming the ecu must look for a drop in o2 after operating the egr valve as there is...
February 04, 2013
1997 Subaru Legacy Outback 2.5L MIL Lamp on VIN: 4S3BG6852V
P0400: Insufficient EGR System Flow Detected. We have this subaru with and ongoing P0400. EGR flow. Passages are clear, we can pull valve at idle with vavuum pump and it will almost stall. We found a small pin hole in the modulator and replaced that. Removed the little filter in the line before the map se...
February 18, 2013