CEL need help

[vsix]

Hi friend's,

you guy's allready know that I bought the diagnostic tool from Carly ( former BMWhat ) because once in a while an CEL started to pop up.
I managed to erase it but it just keep's on coming, indicating a real problem.
So since I'm not sure what it is, would you guy's would help me pointing the gremlin out?


*Check the Carly App screenshot's out that are from my Iphone*

[vsix]

This here is my Life-log I've done with the Carly App, look at the much lower O2 Sensor value.

[tbrown1985]

that's the backup battery for the alarm siren. It's common. It wont cause a CEL though.

[vsix]

Catalytic Converter

[tbrown1985]

the 9d12 that is.

[vsix]

Originally Posted by tbrown1985

that's the backup battery for the alarm siren. It's common. It wont cause a CEL though.

Got ya, whatabout the other stuff, like the O2 sensor that does show a lower value?

[vsix]

Originally Posted by tbrown1985

the 9d12 that is.

Clarify

[tbrown1985]

other looks like a bad post-cat o2 or bad cat on bank 2.

[vsix]

Originally Posted by tbrown1985

other looks like a bad post-cat o2 or bad cat on bank 2.

considering the lower O2 value...would you tend to say O2 sensor or an faulty cat?

[tbrown1985]

the post cat o2 only measures the efficiency of the cat. won't effect anything other than passing emissions test. My M5 had this due to bad cats but I would just check the o2 connection/wiring and possibly change that sensor. better yet, swap the 2 post cat o2's and if the code moves to bank 1 then you know that's most likely the issue

[vsix]

Originally Posted by tbrown1985

the post cat o2 only measures the efficiency of the cat. won't effect anything other than passing emissions test. My M5 had this due to bad cats but I would just check the o2 connection/wiring and possibly change that sensor. better yet, swap the 2 post cat o2's and if the code moves to bank 1 then you know that's most likely the issue

Man your the best, thank you will get it on, tomorrow.
*Thank's, appreciate your help*

[tbrown1985]

no problem. report back and let us know how it goes

[vsix]

Originally Posted by tbrown1985

no problem. report back and let us know how it goes

Will do! Uuuhm whatabout the battery code, that you mentioned earlier?

[tbrown1985]

it was pretty common in the M5 world. It's the backup battery for the alarm siren. the only time it would even be useful is if someone tried to steal your car while the main battery was disconnected which would be rare, if ever. If I remember correctly you couldn't just replace the battery which made it a few hundred bucks or so, and most people just ignored it. the only time you even know it's there is when you scan the car like you did

[vsix]

Originally Posted by tbrown1985

it was pretty common in the M5 world. It's the backup battery for the alarm siren. the only time it would even be useful is if someone tried to steal your car while the main battery was disconnected which would be rare, if ever. If I remember correctly you couldn't just replace the battery which made it a few hundred bucks or so, and most people just ignored it. the only time you even know it's there is when you scan the car like you did

Aaah ok, thank's a bunch for your detailed explanation.

[vsix]

Just a short headups:

Will be checking( swapping )in an hour my O2 Sensors, soon as I get back I will post the outcome.

[vsix]

Originally Posted by tbrown1985

it was pretty common in the M5 world. It's the backup battery for the alarm siren. the only time it would even be useful is if someone tried to steal your car while the main battery was disconnected which would be rare, if ever. If I remember correctly you couldn't just replace the battery which made it a few hundred bucks or so, and most people just ignored it. the only time you even know it's there is when you scan the car like you did

Allright here we go:
Got the car on the lift and I swapped the post cat O2 Sensors.
Now it's time for patiently waiting the CEL pop up back again.

[tbrown1985]

any news?

[vsix]

Originally Posted by tbrown1985

any news?

Yes sir!
No news, after the swap the 02 sensor's aren't acting up anymore?
Maybe the connection was loose and we accidentially got it right( during the swap )

Only thing that still bother's me is that clicking, that occurs just sometime's...
you know my other thread.