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P0400 Diagnostic Trouble Code Discussion for April 2010

Exhaust Gas Recirculation System Flow Malfunction

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Trouble Ticket Help Requests for DTC P0400
Help Request Posted
2002 Mazda Millenia 2.5L MIL Lamp on VIN: JM1TA22132
P0400: EGR System Flow Malfunction. I tested per Alldata and found nothing wrong. While the engine was running I applied vacuum to the EGR valve and the motor ran rough. Thus the passages and the EGR valve are OK. I tested the boostsensor, etc and found no problems. I put my vac gauge in place o...
April 27, 2010