Question about 1998 Mercury Tracer

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1999 Mercury tracer EGR Code making Service Engine Soon light come on How do I wipe the codes out? Failed test. Already replaced EGR Valve.

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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.

Posted on Jul 15, 2009

  • stoner19020 Jul 15, 2009

    sorry not exhaust manifold but your catalic converter. sorry

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Have 1999 Mercury Sable and failed emissions for P0401 code, I replaced the EGR Valve and had the code reset, service engine light came on again Approx 15 miles later. Took it to Auto Zone and they gave...


I am not surprized. The chances that replacing an EGR valve will fix a code P0401 on ANY Ford vehicle is about 1/2 of 1 percent. You most likely either have clogged up EGR ports in your intake manifold, or you have a defective Delta Pressure Feedback EGR (DPFE) sensor.

To find out which it is, apply vacuum to the EGR valve vacuum port with the engine idling. The engine should stumble and/or stall. If it does not, your ports are clogged. If it does, the most likely cause of your problem is the DPFE sensor. However, the EGR vacuum control solenoid could also be the cause.
You cannot properly test the EGR vacuum control solenoid without the proper equipment, but you can check to make sure that there is manifold vacuum going into one side of the solenoid and you can check to make sure that there are no breaks or leaks in the line that runs between the solenoid and the valve. If you find any of these, repair as necessary. If you do not find a problem with the vacuum lines, then you can take a "guess" and replace the DPFE. If this does not work, then you can "guess" again and replace the solenoid. If it still does nort work, then you probably have a bad electrical circuit to the solenoid (once again, requiring the proper equipment to diagnose).

Please also review the following article: What Else Could Be Wrong?

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1 Answer

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If the DTC is P0401 it means that the EGR Valve is clogged or air flow is insufficient.Take EGR valve off and clean carbon out or replace EGR valve with a new one.

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well I'm a mechanic and you just told me what's wrong....
now all you have to do to fix it is test all parts listed replace the one (s) that fail test....

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for p0401:
In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open.
Clean out the EGR valve and/or tubing to remove deposits.
Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model).
Replace the DPFE sensor (with a good quality / OEM one).
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1 Answer

I HAVE ALTIMA 99 AND MECHANIC CAN'T FIGURE OUT HOW TO SOLVE MAP SENSOR PROBLEM. HE REPLACED THE MAP SENSOR, WHICH DIDN'T HELP-'SERVE ENGINE SOON' LIGHT GETS BACK ON AS SOON AS I SHUT AND RESTART ENGINE....


He's right both and the code is the EGR valve. The car won't run with the EGR valve removed but it may be disabled some way. Most of the time EGR vales leak or the senser line stopps up. There's a small medal ine coming up the the EGR senser from the exhaust and connects to the senser this line stops up and the senser knows something aught to be happing and it doesn't so it turns the light on. Your mechanic is right it's not hurting anything but it makes the light on. It can be fixed but it'll not run much different.

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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.

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1 Answer

97 tracer P0401 code won't go away


Late suggestion; it may be that the code needs to be reset via a code reader and that the problem will remain in memory until forcibly removed. That is fairly common.

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2 Answers

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