Repeated Exhaust sensor problem
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Mountain Pass
Joined: Sep 2008
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Repeated Exhaust sensor problem
We have a 2012 F 350 built in April of 2012 and have had three different exhaust sensors replaced. These sensors are in differing places along the exhaust pipe system. It has not been the same sensor each time but differing sensors. Their part number is AC3Z-5J213-A. Ford says there's nothing they can do except replace them as they break. Has anyone else had problems with these sensors? The problem is that when they go bad the whole truck stops dead. It is not comforting to know you can break down at any moment. We have now bought an additional sensor in case we break down in the middle of nowhere. The truck only has 12000 miles.
Last edited by hwheeler; Mar 12, 2013 at 02:54 PM. Reason: grammar
Senior User
Joined: Sep 2005
Posts: 217
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I also have a 2012 built in March 2012, delivered April 6th. We had one Nox sensor replaced at 725 miles along with a computer flash. Had the same "DEF system fault" message again around 4000 miles but they only did a computer reflash that time no sensor change, and since then no problems. We have just under 12K miles now.
Senior User
Joined: Aug 2009
Posts: 234
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From: Hillsboro, Oregon
I've always been skeptical of these sensors since day 1. Then again just about anything these days has one or more sensors. Hope Ford is attempting root cause of your sensor issues. I've only had the DEF sensor misbehave on me a few times while under 3K miles. Sitting at just over 15K miles, built Dec 2011 and so far no sensor issues. To me having the truck stop dead just because of a faulty sensor is unacceptable. Should at least have limp mode or a way to circumvent when way out in the middle of nowhere and no cell service! Guess if I found a way to circumvent Ford would void my warranty.
Trailering
Joined: Oct 2003
Posts: 15
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From: Raleigh
happened to me 2x, left me on the side of the road with trailer attached both times. if i understood the process correctly when the CPU senses a "bad" reading it will cause you to shut down for a specific timed event. I think it is 60 min. i know its harder to do now than it was but mini max was my solution.60k total on truck and 20k with mini maxx.
Elder User
Joined: Aug 2007
Posts: 914
Likes: 1
From: Saskatoon, SK, CA
I've had the NOX sensor go while towing and it is a royal PITA. Previous owner had to replace one as well per the Oasis report when getting my truck fixed in Indianapolis last summer. That's why I bought my H&S MiniMaxx. Haven't deleted yet, but if there are any issues again that rocket ship will be history in a heartbeat!! Possibly sooner if I find new replacement pipes that I like. 
. Definitely plan on deleting before my next 6,000 mile camping trip so I'm not stranded again.
. Definitely plan on deleting before my next 6,000 mile camping trip so I'm not stranded again.
Junior User
Joined: Jul 2011
Posts: 93
Likes: 0
We have a 2012 F 350 built in April of 2012 and have had three different exhaust sensors replaced. These sensors are in differing places along the exhaust pipe system. It has not been the same sensor each time but differing sensors. Their part number is AC3Z-5J213-A. Ford says there's nothing they can do except replace them as they break. Has anyone else had problems with these sensors? The problem is that when they go bad the whole truck stops dead. It is not comforting to know you can break down at any moment. We have now bought an additional sensor in case we break down in the middle of nowhere. The truck only has 12000 miles.
All of it was covered under warranty, that was good.
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