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Unread 01-13-2015, 10:41 AM   #1
davspeed
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2006 WK 
 
Join Date: Nov 2014
Location: kirton lindsey, lincolnshire
Posts: 1
CRD exhaust pressure sensor problem sorted

Hello every one this is my first post on here so I hope it will be of help to some one as repayment for all the useful info I have found on here.

I am UK based and have had my 2006 WK CRD with 100k miles for a couple of months after running a 1997 ZJ 2.5td for the last five years. As it was getting towards 200k I went for a change .

The new car was running fine until last week when after running for about five miles it just coughed and then stopped. It would run a bit in limp mode then OK for a bit then not at all. The engine check light was on but I had no meter and the key waggle did not work.
I managed to coax it home bit by bit and next day got a meter ( should have bought one years ago really) I had three codes p0471,p0472,p0473 all relating to the exhaust back pressure sensor.

I got a bit confused thinking I had a blocked DPF but after looking underneath my car doesn't look like it had one from new so assumed it was indeed the exhaust pressure sensor which is located at the rear of the engine to the right of the turbo.
They don't seem readily available from the usual Jeep parts places and I ended up getting one on eBay from a Mercedes main dealer for 50. the part number is A0071834328 not the same as the one I took out but apparently they have been changed several times.

I fitted it today and have been for a twenty mile run and all is fine again.

ex-sensor.jpg

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Unread 01-14-2015, 05:41 PM   #2
jediknight
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2008 WK 
 
Join Date: Oct 2011
Location: Montreal, Qc
Posts: 487
Very informative !
Thank you.
And welcome to the forum!
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Unread 01-17-2015, 11:31 PM   #3
Red_liner740
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Join Date: Sep 2013
Location: Tottenham, On
Posts: 176
Yea, lots of CEL and lightning bolt light issues are actually related to this sensor but misdiagnosed as turbo actuator/EGR/dpf.

I chased the same problem as you for 2 months, partly because the exhaust back pressure sensor originally bought directly from MB dealership was faulty.
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Unread 01-18-2015, 05:11 PM   #4
Drudgery1971
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2007 WK 
 
Join Date: Mar 2009
Location: Ohio
Posts: 421
Thanks for the info and welcome to the forum. I have a lightning bolt MIL currently but none of those codes and am having the EGR replaced currently. There are many, many issues that can trip the lightning bolt MIL so really glad you got it resolved and was a clean fix - some issues are not so straight forward
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