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  #21  
Old 10-30-2015, 08:24 PM
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Join Date: Mar 2015
Location: USA - Virginia
Posts: 41
regdfry is on a distinguished road
OP

Just to be clear, it is only my opinion you can / should use a diesel additive formulated to "remove" water. You can read these forums until dead tired and still not reach a decision on what to do in this case.

Some will say yes and some will say no to additives:

- BMW says NO (well BMW says not to change your transmission fluid too ; and we know that spells death to your transmission)

- A well respected company makes a product that can be helpful here, by making the water soluble in diesel and allowing it to pass through and burn off. (since likely very little water was sprayed into the tank)

- Look up About Us | Power Service and read about their products.

Some will say change the filter:

- Is that a guarantee to remove the water? Is it really all just sitting there in the filter?

Good Luck

Personally, I use the Power Service Diesel Fuel Supplement +Cetane Boost. I do this primarily to add lubricant to the diesel and the cetane advertised at all stations in my region is "minimum 40". This is a cold weather formulation that also prevents geling and icing of the fuel. There is a summer formulation also. In addition, based on my readings this afternoon, I intend to run some of their Clear Diesel quarterly to remove water (which is in ALL diesel fuel).

Last edited by regdfry; 10-30-2015 at 10:50 PM.
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  #22  
Old 11-23-2015, 01:16 AM
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Join Date: Jan 2014
Location: Cupertino
Posts: 37
windforce is on a distinguished road
UPDATE: 11/22/2015

3 weeks after I went through car wash forgetting to close my diesel fuel cap (fuel tank was full at the time). I filled up my tank to full after it dropped to 1/2, no problem at all. Now it dropped to 1/2 again after total of 400+miles of driving since the car wash.

Engine light came on today. I scanned it with OBD and gave me following codes:

P2201 NOx Sensor Circuit Range/Performance Bank 1 Sensor 1
P124D <--- scanner does not show what this code is
P20EE SCR NOx Catalyst Efficiency Blow Threshold Bank 1

So I took the Nox Sensor out of the SCR under the car, and there were some water at the tip of the sensor, I guess it is not normal. I cleaned and put everything back. Reset the codes (engine light gone).

After driving it to reset ecu and driving cycle, P2201 and P124D shows up as pending and P20EE as permanent. No engine light yet (I think it will come on soon).

I have searched online and many people have replaced NOx sensor ($500) and SCR ($1000+) at dealer.

Do you guys have any idea how I should fix this?
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  #23  
Old 11-23-2015, 08:15 AM
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Join Date: Apr 2015
Location: Washington Island, Wisconsin, thru Death's Door
Posts: 219
Doug Huffman is on a distinguished road
Water is a product of combustion.

Watch your exhaust for a few minutes after start up on a cold morning. Watch the cars around you on your morning commute. Water in the cold exhaust system is normal.
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