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Ford DTC P1405 refers to the Differential Pressure Hose being plugged or disconnected. This is part of the EGR valve system of the emissions system. On the drivers side of the engine there is a metal tube that rises from the exhaust manifold. This tube has two smaller tubes coming off of it, one larger than the other. From the tubes are hoses that connect to the Differential Pressure Sensor/Switch.
These hoses can become dry and crack over time and may need to be replaced. If you find one of these hoses has come off it may be due to excessive pressure from the exhaust. This is generally because of blocked catalytic converters. The typical lifespan of a "cat" is 7 - 12 years. Also, you should check the Differential Pressure Sensor for integrity. If the pressure is too high at the sensor the internal diaphragm may rupture and the hot exhaust gases melt the electronics and plastic housing.
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How do you repair dtc p1405 on 2000 ford Windstar?
usually that code is a hose off or cracked
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