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X5 E70 (2007 - 2013)
E70 BMW X5 produced between 2007 and 2013. Discuss the E70 X5 with other BMW owners here.

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  #1  
Old 10-18-2015, 02:01 PM
Kyle X5 Kyle X5 is offline
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Mein Auto: X5 3.0si
Emissions/catalytic converter

I'm new to the BMW world and had a question about replacing the cat in my 2008 X5 3.0si. I don't want to go to the dealer and spend over a thousand dollars to have it replaced and found a good aftermarket one for less then 200$ but it says it's not for sale in CA and NY for emissions laws but if it were installed would it still pass the inspection test? Or would the computer know it's not technically "legal" in this state?
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  #2  
Old 10-18-2015, 02:20 PM
Alika808 Alika808 is offline
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Question, why do you need to replace it?
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  #3  
Old 10-18-2015, 02:38 PM
Kyle X5 Kyle X5 is offline
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It's got 105xxx miles and the CEL is on and it scanned as "Catalyst system efficiency is below threshold" I was told it's a bad Cat
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  #4  
Old 10-18-2015, 02:54 PM
Alika808 Alika808 is offline
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Maybe it could only the sensors.
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  #5  
Old 10-18-2015, 03:03 PM
Kyle X5 Kyle X5 is offline
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I was told by a technician that BMWs are notorious for cat problems around 100k and to replace the sensors would be a couple hundred dollars as well I don't want to throw money at it and hope it fixes the problem either, is there a way to test the sensors?
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  #6  
Old 10-18-2015, 04:06 PM
Alika808 Alika808 is offline
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First get a BMW OBD Scanner that have live data stream. I have the Creator 110 but the new version is 310. The live data stream can sense if the sensors working properly. I haven't hear that the cat is need to be replace within 100K. The only I heard was clog-up catalytic converter but is rarely.
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  #7  
Old 10-18-2015, 05:10 PM
Kyle X5 Kyle X5 is offline
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I have a scanner, what's a normal reading for the sensors?
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  #8  
Old 10-18-2015, 05:44 PM
ard ard is online now
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Quote:
Originally Posted by Kyle X5 View Post
It's got 105xxx miles and the CEL is on and it scanned as "Catalyst system efficiency is below threshold" I was told it's a bad Cat
MOST of the time it isnt the cat that is bad. Lots of cats replaced unnecessarily.

Quote:
Originally Posted by Kyle X5 View Post
I was told by a technician that BMWs are notorious for cat problems around 100k and to replace the sensors would be a couple hundred dollars as well I don't want to throw money at it and hope it fixes the problem either, is there a way to test the sensors?
Technicians are good and bad. To most civilians, ANYONE with a bit mroe knowledge than they have seem like gods.

For this one to declare "BMWs are notoriously bad" means he is an utter idiot. No doubts

Dont just replace sensors. DOnt just guess. Get a real diagnosis by a qualified tech

Quote:
Originally Posted by Alika808 View Post
First get a BMW OBD Scanner that have live data stream. I have the Creator 110 but the new version is 310. The live data stream can sense if the sensors working properly. I haven't hear that the cat is need to be replace within 100K. The only I heard was clog-up catalytic converter but is rarely.
Bingo.

My guess is that you have something going on causing the car to run very rich- this is overloading the Cats and tripping the errors. Once you fix this issue the Cats will work fine.

You want to be looking at short and long term fuel trims as well as the O2 sensor values....

Actually you want someone ELSE looking at them. A qualified tech who isnt a 'read code=replace part' loser.


Quote:
Originally Posted by Kyle X5 View Post
I have a scanner, what's a normal reading for the sensors?
Dont.
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  #9  
Old 10-18-2015, 05:50 PM
Kyle X5 Kyle X5 is offline
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Thanks ard, it actually had a misfire code also in cylinder 4, maybe fowld spark plugs could cause the codes not running right?
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  #10  
Old 10-18-2015, 06:03 PM
Alika808 Alika808 is offline
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I recommend try to transfer the coil pack to another cylinder and see if the fault follows. Then do the same thing with the spark plug. You need to isolate which one causing the misfire, the coil pack or spark plug.
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  #11  
Old 10-18-2015, 11:48 PM
ard ard is online now
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Quote:
Originally Posted by Kyle X5 View Post
Thanks ard, it actually had a misfire code also in cylinder 4, maybe fowld spark plugs could cause the codes not running right?
Yes, I suppose it could be. But what cause one sparkplug to 'fowl'???

A bad leaking injector could F up your air:fuel ratio...

While I might agree that an isolated misfire would lead to 'change them around find out which is bad', you have something more substantial going on causing the AFR issues and cat codes.

If you want to futz around with it yourself, take a couple of hours and maybe chase some ghsts, sure swap plug, coils, injectors, etc. etc.

Or spend 2-300 for a highly qualified shop to get into it.


A bad plug or coil will not cause CAT efficiency codes
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  #12  
Old 10-19-2015, 06:51 AM
Kyle X5 Kyle X5 is offline
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I'm going to check the readout of the O2 sensors and see if they're faulty and go from there
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  #13  
Old 05-05-2016, 04:27 AM
burak.romania burak.romania is offline
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Quote:
Originally Posted by Kyle X5 View Post
I'm new to the BMW world and had a question about replacing the cat in my 2008 X5 3.0si. I don't want to go to the dealer and spend over a thousand dollars to have it replaced and found a good aftermarket one for less then 200$ but it says it's not for sale in CA and NY for emissions laws but if it were installed would it still pass the inspection test? Or would the computer know it's not technically "legal" in this state?
DID you solve the problem???

i have 2008 X5 3.0si too and i have the same problem with cat.
i delete the error and it appears back again on board after driving 20/25miles and i dont know what to do
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  #14  
Old 05-05-2016, 04:30 AM
burak.romania burak.romania is offline
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Dont.[/QUOTE]



---
1)i have X5 3.0si too and i have the same problem with cat.
i delete the error and it appears back again on board after driving 20/25miles
any solution?

and

2)is there any harm of using bmw scanner C310 OBD2 OBD II - 2016?
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catalytic convertor, emissions, inspection, new york, test aftermarket


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