P0470 exhaust back pressure sensor - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 11-23-2008, 05:41 PM   #1 (permalink)
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P0470 exhaust back pressure sensor

I am getting code 0470 exhaust back pressure. Looks like this points to the EBP sensor. I pulled the sensor and tube and clean it up. It was pretty carbonated but not completely clogged. Cleared my codes drove around the block and still getting 0470. The weird thing is my service engine light is not coming on. It comes on when I turn the key so I know it's not a bulb. Anyway, can you ohm this sensor out to tell if it is good? I'm not having any performance issues. The only reason I even checked my codes is because I got a tuner. Thanks for any input.


2000 7.3 f250

Last edited by galexander; 11-23-2008 at 06:38 PM.
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Old 11-23-2008, 08:10 PM   #2 (permalink)
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Does anybody have a known good one laying around that they could ohm out? I found one on ebay that I'm going to order soon if I can't verify that the sensor is ok.
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Old 11-23-2008, 08:19 PM   #3 (permalink)
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You can't use an ohmmeter on them, as they are a variable capacitance device.

DTC P0470 indicates an EBP sensor malfunction was detected during KOEO On-Demand Self Test.
Possible causes:
damaged EBP sensor
open signal ground
damaged PCM

If you were rooting around too deep in the sensor when you cleaned it you may have damaged it (or it was already bad since you had the code previously). The P0470 won't normally set the SES.

If you can get your hands on a scan tool that will monitor parameters, check to see if it reads somewhere around atmospheric pressure KOEO (Key On, Engine Off). If not, check the resistance of the grey/red wire to ground. If that's less than 5 ohms, then your sensor is bad. If the resistance to ground on that wire is high, then you need to find where it's open and fix it.
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Old 11-23-2008, 08:29 PM   #4 (permalink)
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Ok...thanks. I assume you're talking about measuring at the plug and not the sensor. So a lot of people are driving around with this problem and don't even know it?

Last edited by galexander; 11-23-2008 at 08:35 PM.
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Old 11-23-2008, 08:35 PM   #5 (permalink)
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Quote:
Originally Posted by galexander View Post
Ok...thanks. I assume you're talking about measuring at the plug and not the sensor.
Yep, between the plug and ground.
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