Question about 1998 Mercury Mystique

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I have errors p0300 p0401 p1744 p1152 on my 1998 mercury mystique

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Posted on Jan 02, 2017

nicole99wu
  • 1049 Answers

SOURCE: 1999 mercury sable engine code

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).
Replace the EGR valve.

Posted on Jul 08, 2011

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1 Answer

Code p1744


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What are codes p0401 and p0300 mean on a 2000 isuzu trooper


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1 Answer

P0300 code changed spark plugs p0302


Cylinder 2 is misfiring. Spark plug could be faulty or spark plug wire could have broke internally if you didn't replace them at the same time. Swap cylinder 1 and 2s spark plugs clear code and drive again. If Same code comes back plug is good look at wire if code p0301 come up the spark plug is no good

Feb 04, 2014 | 1998 Mercury Mystique

2 Answers

Obd2 codes p0401 and p1744


P1744 -transmission intermittent/torque converter is a manufactures code;they have that problem,like the wipers coming on.
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Jun 28, 2012 | 1999 Mercury Sable

1 Answer

2001 mercury sable not wanting to take gas reading a code P0401


To the best of my knowledge, a P0401 is an EGR Sensor error code ( EGR=Exhaust Gas Recirculation) You may want to try cleaning it if you have the tools & ability to take it off. But there is a chance it may need to be replaced no matter what. I hope this helps =)

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2 Answers

1999 mercury sable engine code p1744,p0401. Failed e check. EGR looks new, replaced egr solenoid then cleared codes. what more can i do about the p0401 code and the p1744 code Thanks


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).
Replace the EGR valve.

Jul 08, 2011 | 1999 Mercury Sable

1 Answer

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On that model it is almost always the torque convertor.

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Obd codes p0300 p0301 p0303 p0305 p0401


P0401 Exhaust Gas Recirculation Insufficient Flow Detected

P0300 Random/Multiple Cylinder Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0303 Cylinder 3 Misfire Detected
P0305 Cylinder 5 Misfire Detected


I would check out the EGR valve. That maybe what is causing all the misfires.

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1 Answer

Engine service light / 4 codes read description below


P1744 is probably the TC going on the way out. :(

P 340 is probably the sensor itself. Don't get the Dorman one if it is the OHV motor.

P 401 is probably a bad DPF EGR sensor.

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