My Diesel Exhaust Fluid experience - 8/2011 X5 xDrive35d

[josiahg52]

One sensor is pre-SCR and one is after so there should be a difference between 'sensor 1' and 'sensor 2'. I can look into this a little more as it's important to me also. I'll see if I can get Carly working. The Torque app might also display data like this.

[fullmetaljacket]

Originally Posted by josiahg52

One sensor is pre-SCR and one is after so there should be a difference between 'sensor 1' and 'sensor 2'. I can look into this a little more as it's important to me also. I'll see if I can get Carly working. The Torque app might also display data like this.

Thanks so much! I want to find out where to locate these 2 NOx sensors and the differentiation of NOx sensor I and II. Is NOx sensor 1 before catalytic or after and so on..?

BTW, I have screenshots of what I got from Carly. Just having diffculty posting it here. Let me try again.

From Carly...

0041 F9
DeNOx system, plausibility

00474C
DeNOx system, warning and
Abschaltszenario

004748
DeNOx system, warning and
Abschaltszenario

[josiahg52]

I would consult WDS and identify the wire colors to be sure. Check the ETK to see if they might have different part numbers. TIS might call them out as well. I'd guess the front one is #1 and the back is #2.

[fullmetaljacket]

Thanks!

Can you take a look at this photo and tell me which one - A or B is going towards the front of the vehicle? planning on doing a DIY replacing the 2 NOx sensors this coming weekend. Just wanted to make sure.



https://photos.app.goo.gl/hYtfGMN4uzMHFFhu9

Also what does these numbers mean on the scanner. Is -0.02 the bad NOx sensor? Been trying to search "NOx concentration determination" mean but cant find a definition...

https://photos.app.goo.gl/xDaEfKmPFtGHrLnp9

[fullmetaljacket]

Hello again, so here's how my problem progressed. WIshing I could get some help with this problem. Please note that we dont have any emission regulation where I am located hence I really find this issue a PITA :-( I wish I could delete the whole SCR thing (grrrr) but lets tackle that later on..

So a month ago, I got the 200 miles countdown and the incorrect fluid warning message. Refilling the DEF fluid didn't clear/solve the issue so I brought it to an indy BMW certified shop. They did the "process of elimination" methodology: started with draining the DEF tanks, cleaning them and checking the metering valves. Everything checked out ok. Then they went on to the NOX sensors and found NOX sensor #2 defective hence they replaced this.

After replacing the NOX sensor #2. It seemed like they have eliminated everything related so I was instructed to run the X5 on a dyno for 1 hour continuously running at 70kph. They said the fault will clear out after I do this. So I did that today. UNFORTUNATELY, that did NOT reset the countdown and I am now down to 86 miles to complete shutdown. Of course I brought the X5 back to the shop. They said they will run some tests again and will keep me posted. That's where I am right now after more than 1 month of having the X5 in the shop (waiting for the flushing, cleaning and parts NOX sensor took 1 week to ship).

Did you guys find anything wrong with the things that were done? Any step missing?

Million dollar question is...I really want to delete the whole SCR thing because I dont need it. Is there a thread or DIY you can point to me so I can have this procedure done? I really dont have any use for the SCR because we do not have any regulations on emissions here? Any suggestion will be very much appreciated. TIA!

[spyro235]

Originally Posted by fullmetaljacket

Hello again, so here's how my problem progressed. WIshing I could get some help with this problem. Please note that we dont have any emission regulation where I am located hence I really find this issue a PITA :-( I wish I could delete the whole SCR thing (grrrr) but lets tackle that later on..

So a month ago, I got the 200 miles countdown and the incorrect fluid warning message. Refilling the DEF fluid didn't clear/solve the issue so I brought it to an indy BMW certified shop. They did the "process of elimination" methodology: started with draining the DEF tanks, cleaning them and checking the metering valves. Everything checked out ok. Then they went on to the NOX sensors and found NOX sensor #2 defective hence they replaced this.

After replacing the NOX sensor #2. It seemed like they have eliminated everything related so I was instructed to run the X5 on a dyno for 1 hour continuously running at 70kph. They said the fault will clear out after I do this. So I did that today. UNFORTUNATELY, that did NOT reset the countdown and I am now down to 86 miles to complete shutdown. Of course I brought the X5 back to the shop. They said they will run some tests again and will keep me posted. That's where I am right now after more than 1 month of having the X5 in the shop (waiting for the flushing, cleaning and parts NOX sensor took 1 week to ship).

Did you guys find anything wrong with the things that were done? Any step missing?

Million dollar question is...I really want to delete the whole SCR thing because I dont need it. Is there a thread or DIY you can point to me so I can have this procedure done? I really dont have any use for the SCR because we do not have any regulations on emissions here? Any suggestion will be very much appreciated. TIA!

I'll shoot you a PM in a few. Check there. However annoying it is, modifying oem emissions systems is illegal. That is public knowledge, regardless of what my signature leads anyone to believe.

[fullmetaljacket]

I thought I'd update you guys on what has happened after 11 months on this...

Oh by the way, no problem on legality, laws and rules on emission where I am from so no worries.

Taking off from my last post March 2nd this year, they took down everything and found the DPF, exchange pipe the culprits and advised to replace these parts. Finally the parts arrive and just waiting for them to install. It's been 11 months now which is ofcourse also due to the pandemic thing.

Hope you don't mind my questions to the group here...

1. Do you I really need to fix the original problem 1st BEFORE doing the SCR delete? Because I suggested a SCR delete initially and they said that the delete can't be done if they didn't resolve the original problem first - which is the 200MLS countdown thing. So fix this first before do the delete...something like that.

2. Will there be any computer ECU re-coding / encoding if a SCR delete kit is installed? Will the coding be a DIY or has to be done by an indy or dealer?

3. They also mentioned that I should've gotten the original OEM DEF Fluid when I first attempted to refill the DEF tanks because using other non OE brands has clogged up my system. Is this true? I thought DEF fluids are DEF fluids regardless of OE or non OE brands :-(

I tried to get in touch with another indy mechanic who has a below standard shop but he was formerly a mechanic in BMW Germany and trained there for many years before deciding to come home and set up a BMW indy shop. He said that "there is a SCR delete kit that I can buy and he will install and re-program the computer then bypass the EGR as well". He will give me a quote on Monday. Does he make any sense or am I being taken for another loooong ride here? Is it as simple as that? Im hoping it is. Any thoughts will be greatly appreciated. Thanks.

[CleanIsFast]

I use OEM DEF fluid, its already cheap. Never had any issues as well, I just filled up 2 bottles in the passive tank just because I know it's been close to 8k miles since last time i filled up. I bought the large OEM 5 gallon fluid, keep it in storage and 1 quart bottle with the top cut-off for when i need to refill

[Diesel X5 35d]

There is no difference between OEM and any other DEF. None. BMW doesn't manufacture the product, they just sell under their brand. Walmart is usually the cheapest. Same with all of their products... BMW gin, anybody???

[fbabroff]

Originally Posted by fullmetaljacket

I thought I'd update you guys on what has happened after 11 months on this...

Oh by the way, no problem on legality, laws and rules on emission where I am from so no worries.

Taking off from my last post March 2nd this year, they took down everything and found the DPF, exchange pipe the culprits and advised to replace these parts. Finally the parts arrive and just waiting for them to install. It's been 11 months now which is ofcourse also due to the pandemic thing.

Hope you don't mind my questions to the group here...

1. Do you I really need to fix the original problem 1st BEFORE doing the SCR delete? Because I suggested a SCR delete initially and they said that the delete can't be done if they didn't resolve the original problem first - which is the 200MLS countdown thing. So fix this first before do the delete...something like that.

2. Will there be any computer ECU re-coding / encoding if a SCR delete kit is installed? Will the coding be a DIY or has to be done by an indy or dealer?

3. They also mentioned that I should've gotten the original OEM DEF Fluid when I first attempted to refill the DEF tanks because using other non OE brands has clogged up my system. Is this true? I thought DEF fluids are DEF fluids regardless of OE or non OE brands :-(

I tried to get in touch with another indy mechanic who has a below standard shop but he was formerly a mechanic in BMW Germany and trained there for many years before deciding to come home and set up a BMW indy shop. He said that "there is a SCR delete kit that I can buy and he will install and re-program the computer then bypass the EGR as well". He will give me a quote on Monday. Does he make any sense or am I being taken for another loooong ride here? Is it as simple as that? Im hoping it is. Any thoughts will be greatly appreciated. Thanks.

Hello, you questions are on point!!! I have the same questions, since I just got the error yesterday! Did you ever get it resolved? Can you share! Thanks