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Old 12-22-2012, 04:40 PM   #1
riddles55
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My Ride: 2004 E46 N46 316i
Question Lambda sensor? 2004 N46 316i

Hi all

I'm new here so be gentle! I was hoping someone might be able to help me out with a problem I'm having with my car.

Does anyone know which of the lambda sensors in this diagram correspond to the following error codes:

INPA: 2C45 CDKLSV - lambda sensor in front of cat

DIS: 2C45 DME: Oxygen sensor before cat. conv 1 - Signal offset. Oxygen sensore before catalytic converter B1214_NGLV1_E


DIS says the its "Oxygen sensor B62101" and says "Heated oxygen sensor 1 before catalytic converter"

It shows a circuit diagram but it's not much help to me!

I was thinking it might be part 12, but it could equally be part 1 or 2 (all are before the catalyst)...

Any help would be much appreciated!

Thanks!_a_
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Old 12-22-2012, 04:57 PM   #2
ac_2007
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Could be either one, it doesn't specify which bank.
The DIS code might have some more meaning to it, but O2 sensors are to be replaced in pairs. Especially pre-cat sensors.

P/Ns:
11787512975
11787512976
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Last edited by ac_2007; 12-22-2012 at 05:51 PM.
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Old 12-22-2012, 05:05 PM   #3
riddles55
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Thanks. Trouble is, according to that diagram, there are 3 lambda sensors pre-cat (parts 1, 2 and 12). Would plugging the car up to INPA and looking at the voltages give better idea of which of the three are at fault (I'd rather not replace all three because they are expensive!)?

DIS does say its sensor 1 - could that be bank 1. It also says its sensor B62101, is there a way of figuring out which sensor that code corresponds to. I've googled b62101 but with no luck.
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Old 12-22-2012, 05:54 PM   #4
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I'm not sure if the N46 has 2 stages of catalytic converters, but it looks like it does.

It would be either 1 or 2, which are both before the first cat.
My mistake on the previous P/N, you have 2 sensors in the first set of bungs, which are only 1 number apart.

If one is giving you issues, you'll need to replace the other one shortly after anyways, and your ECU will not be getting optimal readings from 1 new and 1 old sensor.
That can mean an inefficient fuel burn (higher consumption), misfires, and 2x the labor to do what you should've done in the first place.

The P/Ns are:
11787512975
11787512976

http://realoem.com/bmw/showparts.do?...43&hg=18&fg=10
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