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P0400 Diagnostic Trouble Code Discussion for November 2004

Exhaust Gas Recirculation System Flow Malfunction

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Trouble Ticket Help Requests for DTC P0400
Help Request Posted
1999 Subaru Legacy Limited 30th Anniversary 2.5L MIL Lamp on VIN: 4S3BD6856X
P0400: Insufficient EGR System Flow Detected. Car sets P0400 [egr flow malfunction} intermittently. May take several days to turn the light on. Tested the egr valve-opens fine and causes the engine to stumble. Checked all the hoses for cracks-leaks-obstuctions ect. Tested the modulator valve [ok]. Tested ...
November 03, 2004