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Posts Tagged: P0400

P0400 Nissan Altima

Fix code P0400 Nissan Altima Exhaust Gas Recirculation Flow Malfunction Owners of 1999 Nissan Altima 2.4L and 2000 Nissan Frontier 2.4L vehicle may encounter a P0400 Nissan Altima with a check engine light. Owners may also notice an engine stall at idle when the vehicle is warm. Before you start replacing parts, learn how the system works and test each component according to this procedure. Start by checking the rubber hose that goes to the bottom of the EGR back pressure transducer. The transducer measures the amount of “backpressure” in the … Read More

P0400

Fix code P0400 Exhaust Gas Recirculation Flow Malfunction If you have a P0400 Exhaust Gas Recirculation Flow Malfunction trouble code, read this to understand what it means EGR stands for Exhaust Gas Recirculation. At high combustion temperatures, the Nitrogen in the air can combine with the air fuel mixture to produce Oxides of Nitrogen–a key component of smog. To reduce combustion chamber temperatures, the EGR valve opens and sends in a ballast charge of exhaust. Because sending exhaust into the mixture at idle would choke the engine, this is usually … Read More

P0400 – Ford Mercury Vehicles

Fix trouble code P0400 – Ford Mercury Vehicles A P0400 code indicates insufficient EGR flow. This could be caused by several things: restricted or carboned up passages, sticking pintle on EGR valve, or a problem with the vacuum supply to the EGR sensors. The computer commands EGR operation and the Backpressure Transducer measures the pressure (or lack of it) to determine how well the EGR valve did in allowing EGR flow. The Transducer has several hoses going to it and this seems to be a common failure point in getting … Read More


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