[Greck]

I replaced the SCR cat, but the issue is still there... Have no idea what to do next...

[Greck]

New results:

[Hoooper]

Does it tell you what the minimum conversion % is to set the 4d16 code? Its obviously working, just dont know what is considered an acceptable conversion %

What is the SCR catalytic converter ageing factor temperature a measurement of? That number stands out as unusual

[Greck]

Originally Posted by Hoooper

Does it tell you what the minimum conversion % is to set the 4d16 code? Its obviously working, just dont know what is considered an acceptable conversion %

No, it does not tell anything else except this pictures...

Originally Posted by Hoooper

What is the SCR catalytic converter ageing factor temperature a measurement of? That number stands out as unusual

Agree, I don't know what does it mean but is looks weird

[cm335d]

Originally Posted by Greck

No, it does not tell anything else except this pictures...



Agree, I don't know what does it mean but is looks weird

I know this is an old thread but was curious if this issue was ever solved. I'm on the cusp of replacing the Cat myself after the stealer replaced the two NOX sensors and urea tank.

[DougNBodie]

If you're under 100,000 miles BMW should replace the CAT for free. I got a letter stating that a year or two ago. Same for Turbo's.

[cm335d]

Originally Posted by DougNBodie

If you're under 100,000 miles BMW should replace the CAT for free. I got a letter stating that a year or two ago. Same for Turbo's.

My car has 109k on it currently. I'll be installing a new to me, low mileage cat here shortly. Hopefully, this will resolve the SCR efficiency issue.

[cm335d]

Finally got my 'round to-it' and replaced the cat with a known good one. Had to weld it on, but nevertheless, it solved my SCR Efficiency code problem.

https://photos.app.goo.gl/bPJpXAcMcKKqfkYm8

[peteyypab]

Originally Posted by cm335d

Finally got my 'round to-it' and replaced the cat with a known good one. Had to weld it on, but nevertheless, it solved my SCR Efficiency code problem.

https://photos.app.goo.gl/bPJpXAcMcKKqfkYm8

Where did you find a low mileage used unit? I'm at 145k and ISTA reports that it is my turn to replace the CAT

[MTB_LJR]

Originally Posted by peteyypab

Where did you find a low mileage used unit? I'm at 145k and ISTA reports that it is my turn to replace the CAT

I have one with about 70k miles on it. I have to look at my spreadsheet to be able to tell you exactly how many miles it has on it. You would just have to weld it in since mine was cut out. Just PM Me.