DTC P1400

Tiny
DOCTORD453
  • MEMBER
  • 2003 FORD TAURUS
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 129,000 MILES
ECM or CEL was throwing a code of p1403 for DPFE(differential pressure feedback sensor). Replaced the sensor. Not the problem. Now throwing a DTC p1400 (EGR valve position sensor) and blowing the passenger side hose off of the DPFE sensor. Car runs poorly. Very little power on acceleration and irregular transmission shifting. Also, seemed to almost run hot once or twice but could not locate coolant system problem before poor running condition and DTC codes appeared.
Monday, February 26th, 2018 AT 1:21 PM

79 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Good afternoon.

You have too much back pressure going to the sensor. That is a result of a catalytic converter being clogged and the exhaust cannot flow freely through the system. It is backing up into the sensor.

You will need to replace the catalytic converter. They come as an assembly with both together.

Roy
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Monday, February 26th, 2018 AT 1:44 PM
Tiny
DOCTORD453
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Replace the catalytic converter. Sounds right to me. Thank you so very much for your time and consideration of my problem. You are providing an invaluable service free of charge. That is impressive in today’s money driven economy. Thanks again for your knowledge and expertise. You are appreciated.
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Tuesday, February 27th, 2018 AT 4:29 AM
Tiny
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You are welcome.

We are here to help.

Roy
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Tuesday, February 27th, 2018 AT 4:32 AM
Tiny
DOCTORD453
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Hey is there two catalytic converters in this car? And if so, are both presumably bad? Or could it be just the one? And how difficult is it to change? Does it need welding to install, or does it bolt on? And I also assume it does need to be replaced with a new one? And not just break the insides out of this one and reinstall it? I’m sure that would interfere with sensor readings to the ECM as well as proper back pressure in the exhaust. Just curious.
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Thursday, March 8th, 2018 AT 9:43 AM
Tiny
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They come as one unit. Both together. You can buy separately but not recommended.

Is this the U motor? That would be the 8th digit in the VIN number

Roy
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Thursday, March 8th, 2018 AT 9:54 AM
Tiny
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Yes it is a U motor.
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Friday, March 9th, 2018 AT 10:42 PM
Tiny
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Thanks. Attached is the converter assembly from rock auto. You should replace with this assembly. there are several available but walker is the best brand to buy.

Roy

https://www.rockauto.com/en/catalog/ford,2003,taurus,3.0l+v6+ohv,1415214,exhaust+&+emission,catalytic+converter,5808
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Saturday, March 10th, 2018 AT 5:40 AM
Tiny
DOCTORD453
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Thank you. I will check into getting one and attempt to install. Do I need to replace 02 sensors as well?
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Saturday, March 10th, 2018 AT 5:36 PM
Tiny
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No, just change them over to the new converter

Roy
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Saturday, March 10th, 2018 AT 5:38 PM
Tiny
DOCTORD453
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  • 46 POSTS
Now I am confused. Trying to locate exact catalytic converter. They have front driver side converters, front passenger side converters, center converters, rear converters, and y pipe converters. It appears the y pipe converters are for DOHC engines. Which I believe mine is an OHV and not a DOHC. So eliminating the y pipe converters leaves me with a front driver side, front passenger side, center, and rear to choose from. And the prices for these converters seems outrageous to me. Some of them are priced more than the car is worth. $2200 at one place. Would I be better off to buy a universal fit and take the car to have I welded on? Wouldn’t I come out cheaper this way?
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Tuesday, March 13th, 2018 AT 6:16 PM
Tiny
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If you got the one from rock auto as I sent you and you took it to a shop and had them change it you would be looking at around 500

Roy
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Wednesday, March 14th, 2018 AT 4:14 AM
Tiny
DOCTORD453
  • MEMBER
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That link to Rock Auto directed me to a page starting with Ford asking me for the year of car. Then it proceedes to ask for model, sub model, engine type, then the category or parts. Where I have to direct it to the page with catalytic converters. There are probably 15 or more different converters on this page starting with a rear converter, then a front y type converter, then a right converter. These are followed with several other converters including rear main converters as well as center converters. Knowing the engine group being 3FMXV03. OVF4 it still isn’t clear to me which of these converters I need. I apologize for the confusion. I am fairly knowledgeable about most vehicle trouble shooting and repair. But this is an area I have never encountered and therefore am not very familiar with. I thank you for your patience I in dealing with my issues.
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Wednesday, March 14th, 2018 AT 11:44 AM
Tiny
ASEMASTER6371
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No worries. you said your 6 th digit was a U. This is the converter you need

https://www.rockauto.com/en/catalog/ford,2003,taurus,3.0l+v6+ohv,1415214,exhaust+&+emission,catalytic+converter,5808
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Wednesday, March 14th, 2018 AT 11:48 AM
Tiny
DOCTORD453
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So just to clarify,
this Davidco, part #59086, rear converter for $91 is the right one?
Image (Click to make bigger)
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Saturday, March 17th, 2018 AT 4:09 PM
Tiny
ASEMASTER6371
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No, the 59071. The one you are looking at is a warm up converter. That is not the failure. It is the front 2 converters.

Roy
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Saturday, March 17th, 2018 AT 4:16 PM
Tiny
DOCTORD453
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  • 46 POSTS
Well I have ordered the converter. Should be here on Tuesday. I’ll let you know the out come. Thanks again for all your help.
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Monday, April 2nd, 2018 AT 12:20 PM
Tiny
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No problem, glad to help
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Monday, April 2nd, 2018 AT 12:50 PM
Tiny
DOCTORD453
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The converter came in today. But nothing else was with it. It said it comes with all necessary hardware, bolts, flange gaskets, and heat shields. I do need new bolts and gaskets, don’t I? I can’t use the old ones, right?
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Tuesday, April 3rd, 2018 AT 11:57 AM
Tiny
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Yes, you can use the old ones.

Roy
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Tuesday, April 3rd, 2018 AT 12:00 PM
Tiny
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Oh. Okay. Well let’s get it on the lift and see what I can do with it then.
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Tuesday, April 3rd, 2018 AT 12:07 PM

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