Question about 1999 Mercury Mountaineer

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Need to replace my dpfe sensor on my 1999 mercury mountaineer. Where is it, i would like to change it myself

I need to replace my dpfe sensor on my 1999 mercury mountaineer. Where is it, i would like to change it myself

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The sensor is on the rear of your engine next to the firewall on the 5.0 looking at the egr valve just to the right of it, has two small bolts holding it on and holding the stamped steel bracket for its up against

Posted on Jun 04, 2009

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I believe the sensor that you are looking for is on the drivers side of the engine. If you have a 4.0 SOHC engine or a 5.0 engine the wiring will be the same. You will have a brown with a white tracer, a brown with a light green tracer, and a grey with a red tracer to the sensor. If you you have a 4.0 EI then you will have a Brown with a white tracer and 2 brown with a light green. If you follow the 2 tubes coming up from your exhaust manifold you should be able to locate your sensor it will have to tubes or hoses going to it from your exhaust manifold. Good luck.

Posted on Apr 18, 2009

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1 Answer

I have po401 code that show up what shall I look for to fix this problem


There are two tubes from the Exhaust to a sensor called the DPFE, make sure they do not leak.

Unplug the wires to it, make sure the terminals are not corroded, clean them anyway, try it again.

Replace the DPFE sensor if no good, also replace both tubes (hoses) as they will most likely break when you take them off.

On vehicles that are no well maintained you also wany to remove the EGR valve and make sure the ports are not clogged.

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The EGR valve takes exhaust gases and inserts them into the intake. Generally the EGR is near the center of the engine toward the back. It should be connected to the intake manifold and a pipe that comes from the exhaust manifold. It's not terribly difficult to change.

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You will need to get the parts from the dealer.

What engine?

the EGR valve is generally located on the backside of the intake plenum near the throttle body. There will be a metal pipe that goes in between the EGR valve and the exhaust manifold. If you follow that pipe you will run into to rubber looking hoses. the DPFE sensor will be on the other end of those two hose. The hoses are two different diameters as well as the fittings that they attach to. Make sure you have the right hose going to the right fitting.

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these vehicles as well as every other Ford vehicle has had problems with the DPFE sensors going bad. Ford had a program for this problem but was limited to time and mileage. You can contact a dealer to see if it still qualifies if not the sensor will need replacement. this is very easy to replace

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