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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > Lambda Probe Location?



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      10-21-2019, 05:11 PM   #1
aaronblack
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Excuse my ignorance, never have changed a lambda probe before, I've a 2C9F code in INPA and P0056 on a generic code reader.

I understand the code is BANK 2 meaning cyl 3, 5 & 6 and its post cat! But isn't their 2 probes post cat? How would you know which it is to replace?

There are 4 probes in total according to RealOEM:
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      10-21-2019, 05:18 PM   #2
IllSic_Design
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That would be the o2 sensor at the bottom/rear of the down pipes and the one located towards the outside of the vehicle.
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      10-21-2019, 05:59 PM   #3
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The only difference between the two post-cat sensors will be the length of the wire but to be honest they will not do a great deal on a UK based E92 anyway. The mixture will be controlled by the two pre-cat lambda sensors and the post-cat jobbies will tell you if the cats are working or not.

Probably different in California though. Some US States have tighter emissions controls than we have. In fact I read somewhere that OBDII was originally developed so that folk could drive cars in Florida since open loop systems could not meet their emissions requirements.
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      10-22-2019, 01:51 AM   #4
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You trace the exhaust pipework from cylinders in bank 2
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      10-22-2019, 04:22 AM   #5
aaronblack
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I assume it's number 3 or 4 whichever is bank 2! Cheers for the help
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      10-22-2019, 06:54 AM   #6
therealdb1
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Yes, sorry should have answered your question.

It will be 3 or 4. Easiest way to check is to follow the exhaust pipe from the rear 3 cylinders as Andystobbs says but if you want to order the probe before climbing under the car get the one with the longer wire and a cable tie!

Where will you buy the lambda probe from? Someone like Cheltenham will give you a discount on a genuine BMW part if you mention this forum and will also be able to confirm the correct sensor if you give them your chassis number.
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      10-22-2019, 08:15 AM   #7
aaronblack
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Quote:
Originally Posted by therealdb1 View Post
Yes, sorry should have answered your question.

It will be 3 or 4. Easiest way to check is to follow the exhaust pipe from the rear 3 cylinders as Andystobbs says but if you want to order the probe before climbing under the car get the one with the longer wire and a cable tie!

Where will you buy the lambda probe from? Someone like Cheltenham will give you a discount on a genuine BMW part if you mention this forum and will also be able to confirm the correct sensor if you give them your chassis number.
Cheers 👍, I'll contact Cotswold and see what they will offer.
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      10-31-2019, 09:39 AM   #8
aaronblack
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Got quoted £178 for the sensor! Not sure but it does seem a little on the high side considering eBay/amazon sellers are selling these for £60-90 last time I checked.
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      10-31-2019, 05:03 PM   #9
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I'd trust the eBay/Amazon probe about as far as I could throw it...and I've not got a good throwing arm!

Buy cheap, buy twice. Especially true with sensitive electronics like lambda probes.
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      10-31-2019, 05:08 PM   #10
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Quote:
Originally Posted by aaronblack View Post
Got quoted 178 for the sensor!
From a dealer, you will do. Buy Bosch from your local motor factor.
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