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Old 03-06-2011, 07:52 AM   #1
Senior Member
Join Date: Jun 2007
Location: Helena, Montana
Posts: 613
Exhaust Back Pressure Sensor Circuit Malfunction

Engines can fail at the most inconvenient times!

A couple of weeks ago, I came home at noon on a snowy Friday to send my wife off to an all girls skiing weekend. As she drives off to Missoula in our other vehicle, a Honda Element, I start up the Sporty to drive back to work for the afternoon. It is about 10 above and snowing heavily, and the diesel starts up pretty roughly, making odd whuffing sounds while the check engine light starts flashing. I drive around the block slowly, and can barely get up to 20mph, so I check the Scanguage which gives me a P0470 error code.

After parking back in the driveway, I research the code online, which says Exhaust Back Pressure Sensor Circuit Malfunction. I call the Ford service department, and they say to bring it in before they close up for the weekend. Back in the Sporty, I have to crawl at 20mph in 4WD through heavy snow six miles across town to the Ford dealer. By this time it's mid afternoon and they are very busy finishing up vehicles for the week, so they reschedule the work for Monday morning, after determining that the engine is in Limp Mode, and the turbo will not work with this error code situation.

Being vehicle-less in the snowstorm, I call the insurance company, Progressive, to see if they will pay for a rental car. Nope, the policy doesn't pay for breakdowns, just accidents. Next time I will drive over a curb outside the Ford shop and call in an accident.

I walk over to the Enterprise dealer down the street, and end up with a Hyundai with summer tires on it. The drive back home is way too exciting with 8 inches of fresh snow on top of ice in rush hour traffic.

On Monday, the Ford techs reset the engine computer, but are unable to detect anything wrong with the exhaust system or the turbo (which I had cleaned a year ago at 30,000 miles).

So far, driving the van every third day or so, I have not had a re-occurrence of the Error Code. It is better to break down in town rather than in Death Valley for sure, but it was not how I wanted to spend the weekend. At least the wife had a fun ski holiday!

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Old 05-19-2011, 11:39 PM   #2
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Join Date: Dec 2008
Location: San Diego
Posts: 502
Re: Exhaust Back Pressure Sensor Circuit Malfunction

Here's a good one - my EBP sensor "failed" while sitting in the Ford Service parking lot last Monday. The van had been in for its 4th Turbo failure (CEL from over boost due to rust and carbon) and I had them park it for me to pick up after dinner with my wife. Several hours later then I hopped in and started it and had the CEL come on immediately. Since they were already closed I drove the few miles home and took it back the next day for the diagnosis. They swear there was no light when they test drove it and parked it but then only charged me for the part ($115) and not for the labor. maybe they felt sorry for me. What can you do? Could it have been damaged accidentally during the turbo work?
2004 SMB 4x4 RB 6.0 PSD; ARP Head Studs, Gen 3 Cylinder Heads, BPD Oil Cooler connected to AMSOil Bypass, a whistling Wicked Wheel Turbo, Coolant Filter, Upgraded alternator, ScanGauge, SCT custom and SMB Fox shocks.
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