:please: explain p0471! - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 04-08-2013, 05:52 PM Thread Starter
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:please: explain p0471!

I can't find anything on what this code does...... I know what it is but what does it cause? Why is it being thrown?



1999 F250 Lariat 4X4 Offroad
Under the hood: 7.3 diesel, 4in straight piped to 6in shotgun dual stacks, DIY 6637, Bigg Boost. Foil delete. Riffraff FRx. IH Bellowed Up Pipes. Wicked Wheel Gen 1. TS Chip with canned tunes
Cosmetic: Bushwhacker fender flares. Moto Metal 951 18's wrapped with Nitto Trail Grapplers 295/70/18
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post #2 of 12 Old 04-08-2013, 05:56 PM
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OBD2-OBDII Engine Light Trouble Code P0471 FORD - Exhaust Pressure Sensor Range/Performance | Engine-Codes.com

P0471 FORD - Exhaust Pressure Sensor Range/Performance

Possible causes
- Faulty Exhaust Back Pressure Sensor
- Exhaust Back Pressure Sensor harness is open or shorted
- Exhaust Back Pressure Sensor circuit poor electrical connection

Tech notes
Replacing the exhaust back pressure usually takes care of the problem

P0471 FORD Description
The Exhaust Back Pressure (EBP) sensor is a variable capacitance sensor that, when supplied with a 5-volt reference signal from the Engine Control Module (ECM), produces a linear analog voltage signal that indicates pressure.

The EBP sensor's primary function is to measure exhaust back pressure so that the ECM can control the exhaust back pressure regulator (EPR) when needed.

2002 F250 CCSB 4x4
PHP Phoenix, John Woods VB, NUC bypass, 6637

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post #3 of 12 Old 04-08-2013, 05:59 PM Thread Starter
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Thanks! I did not know this sight existed.



1999 F250 Lariat 4X4 Offroad
Under the hood: 7.3 diesel, 4in straight piped to 6in shotgun dual stacks, DIY 6637, Bigg Boost. Foil delete. Riffraff FRx. IH Bellowed Up Pipes. Wicked Wheel Gen 1. TS Chip with canned tunes
Cosmetic: Bushwhacker fender flares. Moto Metal 951 18's wrapped with Nitto Trail Grapplers 295/70/18
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post #4 of 12 Old 04-08-2013, 05:59 PM Thread Starter
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Would this code be causeing this?


I think i blew/ started to blow my turbo..school me. I think my turbo is on the fritz.... What do I look for? What are the symptoms?

When I go to accelerate I can mash the pedal to the floor and it takes 4-5 seconds before it will go. When it goes it goes, but it takes forever! At cruising speeds 45-70 in my area depending on the road, it jumps and bucks like crazy.
I'm hearing a slightly different whistle from it than normal.
Also, when I shut the truck of, there is a horrible knocking/grinding noise real quick like, like a fast 3 count.
I have really bad compressor surge too.... A wicked wheel is on its way....



1999 F250 Lariat 4X4 Offroad
Under the hood: 7.3 diesel, 4in straight piped to 6in shotgun dual stacks, DIY 6637, Bigg Boost. Foil delete. Riffraff FRx. IH Bellowed Up Pipes. Wicked Wheel Gen 1. TS Chip with canned tunes
Cosmetic: Bushwhacker fender flares. Moto Metal 951 18's wrapped with Nitto Trail Grapplers 295/70/18
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post #5 of 12 Old 04-08-2013, 06:26 PM
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Quote:
Originally Posted by Macon View Post
OBD2-OBDII Engine Light Trouble Code P0471 FORD - Exhaust Pressure Sensor Range/Performance | Engine-Codes.com

P0471 FORD - Exhaust Pressure Sensor Range/Performance

Possible causes
- Faulty Exhaust Back Pressure Sensor
- Exhaust Back Pressure Sensor harness is open or shorted
- Exhaust Back Pressure Sensor circuit poor electrical connection

Tech notes
Replacing the exhaust back pressure usually takes care of the problem

P0471 FORD Description
The Exhaust Back Pressure (EBP) sensor is a variable capacitance sensor that, when supplied with a 5-volt reference signal from the Engine Control Module (ECM), produces a linear analog voltage signal that indicates pressure.

The EBP sensor's primary function is to measure exhaust back pressure so that the ECM can control the exhaust back pressure regulator (EPR) when needed.
Where is the EPR and what does it look like? Never knew these trucks had such a thing


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2003 F250 XLT 6Spd 4X4 ECLB 4" lift 4" turbo back duals, AFE Stage 2 XP, superchips flashpaq (gone soon I hope) GTP38R, Gutted EBPV
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post #6 of 12 Old 04-08-2013, 06:57 PM
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right side of the hpop reservoir. 99 and newer on the back. 97 front
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post #7 of 12 Old 04-09-2013, 05:28 AM
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Interesting. Now I gotta go look lol. Learn something everyday. How does the truck control EBP? With the waste gate? That's about the only way I can figure since these aren't VGT turbos


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post #8 of 12 Old 04-09-2013, 05:37 AM Thread Starter
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I'm still kinda confused.... I had my valve at the turbo unplugged.... Maybe its stuck or something an causing my performance issues? I plugged it in last night. I'm riding with dad today so I haven't had a chance to test....



1999 F250 Lariat 4X4 Offroad
Under the hood: 7.3 diesel, 4in straight piped to 6in shotgun dual stacks, DIY 6637, Bigg Boost. Foil delete. Riffraff FRx. IH Bellowed Up Pipes. Wicked Wheel Gen 1. TS Chip with canned tunes
Cosmetic: Bushwhacker fender flares. Moto Metal 951 18's wrapped with Nitto Trail Grapplers 295/70/18
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post #9 of 12 Old 04-09-2013, 05:57 AM
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Is it hissing like the ebpv is on?


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post #10 of 12 Old 04-09-2013, 06:13 AM Thread Starter
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Naw not hissing....



1999 F250 Lariat 4X4 Offroad
Under the hood: 7.3 diesel, 4in straight piped to 6in shotgun dual stacks, DIY 6637, Bigg Boost. Foil delete. Riffraff FRx. IH Bellowed Up Pipes. Wicked Wheel Gen 1. TS Chip with canned tunes
Cosmetic: Bushwhacker fender flares. Moto Metal 951 18's wrapped with Nitto Trail Grapplers 295/70/18
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