PO476 Code

[hakukamana]

Finally got the truck running, after a lot of trouble shooting and a few parts. Now when its cold it starts right up and runs fine, as soon as it hit operating temp, I get a bucking, surge, intermittent CES light. Pulled codes and it comes back as PO476. Where is the exhaust backpressure sensor on a 7.3 powerstroke? Is there a way to test the sensor?

[AaronSEIA]

Sensor is at the end of a tube I think on the passenger side towards the front. Not entirely sure what it does, but the tube will fill with soot and block the sensor. I think it can be unplugged with no issues.
AaronSEIA

[Patrick Feeley]

You can try removing the tube which goes from the front of the passenger side exhaust manifold, under the alternator, and up to the EBP sensor and cleaning it out (as mentioned). I like to use carb cleaner and some wire rope chucked in a variable speed drill to auger out the soot (old aircooled VW trick). Don't forget about the little section left at the sensor and the sensor. There are some pinpoint tests you can do, but nothing like resistance checks (its a variable capacitor). Cheers!

[Stan96]

Mine was about half plugged at about 85k miles, the end by the exhaust manifold was reduced to about an eigth inch, but the end at the senser was open about a quarter inch, after replacing it, i wondered if i shoulda shoved something down into the exhaust manifold to clear it out as well, I read somewhere that the tube being plugged could affect your fuel mileage but i never really checked it that closely at the time

[Evel486]

P0476 will not set a CEL. You may need to have a scan (not just a code reader) to verify possible other codes.