Where is the exhaust backpressure sensor located on a 2004 ford f-250 diesel?

The 2004 Ford F-250 diesel doesn't have a dedicated exhaust backpressure sensor in the way some gasoline engines or later diesel engines might. Instead, the exhaust backpressure is indirectly monitored. The primary sensor used to gauge exhaust restriction is the EGT (Exhaust Gas Temperature) sensor. A high EGT reading indicates restricted exhaust flow, which is essentially high backpressure.

There's not a single location for this sensor; there's usually one or more EGT sensors in the exhaust manifold or up-pipe (before the turbocharger) depending on the engine configuration (6.0L Powerstroke?). You'll need to consult a repair manual specific to your 2004 F-250's 6.0L Powerstroke engine to locate the exact position(s) of the EGT sensor(s). A diagram showing the sensor location will be very helpful.