13' 35d DeNOx low efficiency

[ard]

Originally Posted by madbim

That would be a heart breaker, any chance the SCR cat is covered under warranty?

There ought to be a little pamphlet in your glove box called "the warranty"...perhaps give it a read?

Or go to BMWUSA and find it

[daytonatrbo]

There is an extended warranty and/or recall campaign. But I'm not up on the details.

[madbim]

Below are the codes I pulled with Carly.

DeNOx system efficiency efficiency at low
Code: 004D18

DeNOx system efficiency: efficiency is too low in the range 1
Code: 0042FC

sorry, unknown fault
Code: 0041F9

DFC
Code: 00474C

DFC
Code: 004748

[madbim]

Not in warranty, BMW is recommending NOX sensors. I did get Rheingold working last night and was able to read vehicle information. It sees the codes, I'm just not familiar with it enough on how to use this as a diagnostic tool. It seems the upstream NOX sensor is most likely the culprit based on others experiences, anyway I can confirm this via Rheingold before I drop 500-600 on the sensor?

[Socale39]

The DEF tanks are under an extended 10yr/120k warranty and if you are under 70k I believe the emission systems are covered under federal emission standards. If you are eligible I'd look into it before pulling out the wallet.

[Badsmerf]

I just had to have mine replaced. My rear nox sensor was bad, then the scr had to be replaced. Next time I'm removing it.

Very similar codes btw.

[madbim]

Originally Posted by Socale39

The DEF tanks are under an extended 10yr/120k warranty and if you are under 70k I believe the emission systems are covered under federal emission standards. If you are eligible I'd look into it before pulling out the wallet.

I'm at 75k, I think some states mandate 8y/80k but I don't believe Wisconsin is one of them.

[ard]

Originally Posted by madbim

I'm at 75k, I think some states mandate 8y/80k but I don't believe Wisconsin is one of them.

Why not read your warranty??????????????????

Federal coverage on the CAT is 8/80k

[madbim]

Originally Posted by ard

Why not read your warranty??????????????????

Federal coverage on the CAT is 8/80k

I understand the cat would be covered, but it seems the dealer thinks the NOX sensors should be replaced next. I'm just trying to confirm this is a valid next step, and diag myself.

Sent from my Nexus 5X using Tapatalk

[Stockx5]

Originally Posted by madbim

I understand the cat would be covered, but it seems the dealer thinks the NOX sensors should be replaced next. I'm just trying to confirm this is a valid next step, and diag myself.

Sent from my Nexus 5X using Tapatalk

I have heard that there is a good chance its not the sensors even when it says it is.

local guy wanted to buy my nox sensors but when he swapped the sensors with someone else with an x5 it still gave the code. can't remember what his codes where but it pointed to the nox sensors.

its confusing because the cat apparently has its own code that should go off but apparently it did not.

there could also be corrosion on the harness going to the nox, or not sure if this is possible but some said a bad battery could cause it.

so who really knows!