Engine codes p207F and P20EE

Hi,

Did this start after refueling or adding DEF (diesel exhaust fluid)? I attached the info related to the codes you provided. They indicate the vehicle is producing excessive NOx gasses. NOx is Nitrogen oxide which is created when nitrogen and oxygen combust under pressure and at a high temp. They are poisonous and are controlled by the vehicle.

Selective Catalytic Reduction (SCR) is the most common method in diesel vehicle exhausts to lower NOx gasses. DEF is added to vehicles with Selective Catalyst Reduction (SCR) like yours to reduce the NOx output to nearly 0.

I hope that made sense, and I hope you understand why I asked if this started after refueling or adding DEF.

If you look at the attachments, it explains what is happening and what needs to be done. I highlighted the section which includes the diagnostics.

Take a look through these and let me know if you have questions. Also, note that the code 207F was rewritten by BMW to be 4D17 (manufacturer code and not a "P" code). You will note that the two, 4D17 and P20EE are identified in the attached info.

One last thought, make sure the engine is running at a normal operating temperature. If it is running hotter than normal, that can cause this to happen as well.

Let me know if you have questions.

Take care,

Joe

See pics below.

Not sure if any fluid was added, bought it as is as a challenge., so the selective catalyst is the catalytic converter?
Not running hot, drove it 30 miles and parked it left it running for a while.

The term selective simply means it targets specific gasses. In this case, NOx gasses in the system. Basically, the DEF is injected into the catalyst to lower NOx.

I hope that makes sense.

Let me know what I can do to help.

Take care,

Joe

Is there a way ti remove the def fluid from both passive and active tank before refilling? If not how do i know if it is full when refilling? the def fluid.

Hi,

The only thing I can say is to remove the blend pump and siphon it. As far as quantity, I attached how much the system holds below. Also, there should be a level sensor in both. The fill level detection in the passive tank takes place by means of two individual sensors that are fitted on the top and bottom of the passive tank. This means it is possible to detect a full tank and an empty tank.

Let me know if this helps.

Joe

See pic below.

What is a blend pump and how to remove it? Sensors will sense they are full, but am asking how will i know they are full when i fill them?

Cleared the codes and rescanned, do you think the statement indicates that the def fluid could be wrong or mixed with water some how?, is there a way to siphon it out with a pump via the fill hole? 3rd one is just codes for the ride level malfunction.

Hi,

Interestingly, I am not finding any of the codes, but based on the description, I would say it does appear to have water/moisture in the system.

As far as removing the DEF, you should be able to siphon it out through the filler.

Let me know.

Joe