P0471 - Dodge Cummins Diesel Forum
07.5 - 09 3rd Gen 6.7L Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine, Transmission, etc...NO ADVERTISING

 
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post #1 of 10 (permalink) Old 04-03-2011, 12:24 PM Thread Starter
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P0471

I KEEP GETTING A RECURRING P0471 CODE,EXHAUST PRESSURE SENSOR 1 PERFORMANCE..ANY IDEA WHAT COULD BE CAUSING IT? WHERE IS THIS SENSOR LOCATED? IS IT EASILY SWAPPED OUT? THE CEL COMES AND STAYS FOR A WEEK OR SO THEN GOES OFF FOR A DAY OR TWO AND COMES BACK. TRUCK SEEMS TO RUN FINE.


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post #2 of 10 (permalink) Old 04-03-2011, 06:55 PM
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the sensor is located on the water outlet housing. there is a tube that runs from the exhaust manifold to that sensor that gets plugged with soot.

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post #3 of 10 (permalink) Old 04-03-2011, 09:12 PM
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Just got that code after a weekend of drag racing and getting on the dyno. If u get on it hard and let off several times you will get this. Atleast that was the case for me. It didn't effect performance for me.

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post #4 of 10 (permalink) Old 04-04-2011, 04:26 PM
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just popped up again. im gonna remove the piping and clean the line out and clean the sensor just incase its covered in soot.

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post #5 of 10 (permalink) Old 04-04-2011, 04:41 PM Thread Starter
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Do you have a pic or diagram so i can find this damn sensor???

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post #6 of 10 (permalink) Old 04-04-2011, 04:45 PM
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Follow the upper radiator hose back to the engine, that is the thermostat housing. Mounted vertically in the thermostat housing is the sensor, it is kinda on an ear closer to the passenger side. there should be a small hole in the sensor that also needs to be freed of soot.

The sensor, the stainless steel tube, and the casting all need to be cleaned.

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post #7 of 10 (permalink) Old 04-04-2011, 04:46 PM
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look at your ex manifold and find the hard steel line coming from it (coming right out the side by the turbo) follow it towards the radiator. right by the thermostate housing you will see a sensor with the wires sticking strait up in the air (three wire) right next to the upper radiator hose. thats the one

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post #8 of 10 (permalink) Old 11-17-2011, 12:45 PM
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Just a follow up. I had this problem code for quite a while and fixed it this last weekend. I removed the sensor (again, this is the exh. manifold pressure sensor right by the coolant goosneck). Sure, enough that little elbow was packed solid with carbon. I cleaned it out, deleted the code and it hasn't come back yet.

Here's my procedure (no gaurentees this is the best way, but it worked for me):

1) Remove the harness connection from the sensor
2) Use a 27 mm deep well socket to remove the sensor from the elbow. ( I think 1-1/16 may work too).
3) Remove the stainless pressure tube from the "elbow block" (that the sensor screws into)
4) Scrape out an clean the carbon in the sensor well (from the top).
5) Clean out the horizontal hole that connects the stainless tube to the sensor well. This is a pretty small hole and for me the carbon was packed solidly in there. I used a 1/16" dirill bit by hand to "drill" it ouut. I found it worked to wrap some electrical tape around the shank on the drill bit to get some twisting leverage).
6) Reconnect the stainless tube.
7) Screw the sensor back in.
8) Reconnect the harness to the sensor.

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post #9 of 10 (permalink) Old 11-17-2011, 08:06 PM
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Diesel Dave .Tried cleaning that horizontal hole with no success.Did you clean it with the drill bit with the housing still on the truck or does it need to be taken off?Does that hole go clear thru to the stainless tubing?

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post #10 of 10 (permalink) Old 11-17-2011, 08:17 PM
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Quote:
Originally Posted by 38short View Post
Diesel Dave .Tried cleaning that horizontal hole with no success.Did you clean it with the drill bit with the housing still on the truck or does it need to be taken off?Does that hole go clear thru to the stainless tubing?
Nope, left it on the truck. I took off the stainless tube and went in with the drill bit from the outside in. There wasn't a ton of room there, but enough to get the job done. I was just twisting the drill bit by hand.

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