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I am not sure that the egr sensor aka DPFE can be tested. Normally you will get a service engine soon light along with a code but I can't remember exactly which code it is. They are notorious for going bad on these vehicles. They can cause a range of problems from a bucking engine to a poor idle, and when they are not functioning your fuel economy suffers. On the Vulcan single cam 3.0 they are located in plain view on the front of the intake manifold just beside the throttle body, two bolts, two vacuum lines, and a wiring connector is all there is to changing them. On the DOHC they are a little more difficult, they are located on the driver side rear of the engine in a tight area to get to unless you have small hands, the rubber lines that attach to them will likely need to be replaced also since they bake to the old sensor due to the heat. Not a very expensive fix but a VERY common problem.
What else can I help you with?
Why is your 2003 Ford Taurus cuts off then restarts while driving?
you need to replace the cam shaft positioning sensor
Where is bank 1 oxygen sensor Ford Taurus 2003?
The bank 1 oxygen sensor on a 2003 Ford Taurus is located on the motor. It is on the top, back part near the firewall.
How do you replace throttle position sensor in your 2003 Taurus?
The throttle position sensor, TPS should be in about the same position as it was in earlier models - so the "Related Question" below should also be helpful.
Wehe is the IAT sensor on a 2003 Taurus SES?
built into mass air flow sensor
How do you replace a 2003 Kia Spectra throttle position sensor?
How to replace throttle sensor kia spectra 2003
Can you replace the Coolant Level Sensor in a 2003 deville?
No, you have to replace the complete tank which includes the sensor.
Fuel pump problems 2003 Taurus?
Drop the tank and replace it.
How do you replace the fuel sensor in a 2003 Grand Prix?
replacing a fuel sensor on a 2003 grand prix?
How long does it take to replace knock sensor on 2003 Kia spectra?
Where is the knock sensor for a 2003 kia spectra
Where is the crankshaft position sensor located in a 2003 Kia Rio?
how to replace the crankshaft position sensor located in a 2003 kia rio
How much is the cost to replace the alternator for Ford Taurus 2003?
Around $400 for a new install.
How do you replace the service ride control sensor on a 2003 suburban?
you take it out.
