Where is the EGR valve located on a 1999 mercury tracer? Is it difficult to replace?

The P1405 trouble code on a 1996 Mercury Tracer indicates an issue with the differential pressure feedback electronic sensor circuit (DPFE). The DPFE sensor is located on the driver's side of the engine compartment, mounted to the firewall.
To locate the sensor hose, follow the black rubber hose that connects to the sensor. The hose will lead to the EGR valve, which is located on the intake manifold.
Unfortunately, I am not able to provide pictures, but a quick online search may yield helpful visual aids.

Watch the videos

https://www.google.com/search?q=replace+the+EGR+valve+in+my+1999+Mercury+mountaineer

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Check EGR system.. Check Idle Air controll valve.. Could be many things start here..Always look for the simplest things first..

Hope this helped you??

You will need to replace the brake light switch, it is located under the dash at the top of the brake pedal arm.

Inlet manifold / rear of cylinder head.

Other than the idle control/throttle sensor the other items will not usually cause bucking or change of idle. After you drive awhile from a cold start the coolant temp sensor comes into play,then the EGR valve if vacuum is involved under load. So I quess your mechanic missed monitoring the 02 sensors after testing the fuel system. Hard to imagine. Have to road test hot for Egr and other drivability issues. You need a good drivability tech and always stick with best in their field. Hard to find. Have you ever gone for a drive with the person going to work on your car sitting in the pass seat. If they don't insist on that before they ever look at your veh or take your money--enough said. Did they call you to see if your happy with their performance? If not move on. MAF,AIT, most likely on idle and EGR on bucking. Quick look at 02 sensors You or they did a good job,Just didn't hit a home run,still on second base.

go to auto zone and ask for a there portable engine dianostic scanner. hook it up under the steering wheel inside the car follow the instuctions and write the code down and clear the code while the scanner is hooked up. if you have an employee do it they will not clear the code. when you go back inside they will run the code and it will give you a pretty close idea of what else could be wrong. egr was replaced but it could be an O2 sensor or your exhaust manifold.

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.

Not difficult at all to service the EGR Valve using a #12 mm socket wrench it is a five minutes job. However the VSV is another history and very difficult to be reached unless you have an elevator After the engine begin stalling I double checked the EGR which was completely carbonized. I cleaned it and also replaced IAC checked VSV and all sensors, but the engine follows stalling. Now I am looking for the Charcoal Canister which I simply can't find where it is located, then I will check the vacuum lines and the transmission sensors, but I have heard that EGR despite cleaned can keep bringing troubles. By the way, anyone has ever heard where in the car is installed the charcoal canister