Where is the downstream lambda sensor?

[EM LEON]

Hi,
I need to change my downstream (after cat, sensor 2) lambda/oxygen sensor, but I'm unsure of it's location. Been searching the net and can't find a picture. I've removed the undertray. Is it just before the flexible section of the exhaust, not far from the EGR cooler?
It's on a mk3 Leon 2.0 TDI xcellence.

I have back pain at the moment so can't spend much time under the car searching around and want to do this as fast as possible.

 

[BillyCool]

My 2014 2.0 TDI 184 CUPA only has one lambda sensor and no post CAT sensor. Not saying yours is the same but I spent a lot of time on the internet and under the car to find out there wasn't one. Has the car raised a fault code so you know you have two!

 

[nd-photo.nl]

@EM LEON I checked the workshop manual and I could not see any mentioning of an O2/oxygen sensor. Also the pictures of the exhaust only show some emission control stuff, but no O2 sensor(s).

D4B80615136-4-cylinder_diesel_engine_(1_6_l_and_2_0_l_4V__TDI_Common_Rail__EA288).pdf

drive.google.com

 

[EM LEON]

Thank you both! That wouldn't explain the scanner code that comes up though. P0136 HO2S circuit bank 1 sensor 2. My engine is the CUNA.
Looking through that manual that nd-photo.nl shared, p.472, I can see a mention of a 2nd lambda sensor. And from this photo, perhaps it is the awkwardly placed sensor just before the flexible section of exhaust.

 

[nd-photo.nl]

@EM LEON That might be it, nice find

[edit]
Yes, thats it

Unscrew lambda probe 1 after catalytic converter - GX7- -arrow- using a suitable tool from lambda probe open ring
spanner set - 3337- .

 

[SuperV8]

My 2014 2.0 TDI 184 CUPA only has one lambda sensor and no post CAT sensor. Not saying yours is the same but I spent a lot of time on the internet and under the car to find out there wasn't one. Has the car raised a fault code so you know you have two!

Our CUPA is Euro 5 - and is a little 'simpler' than the Euro 6 CUNA.
For example, we only have one low pressure EGR, one Lambda sensor, one DPF pressure sensor, and no variable valve timing.

As an aside - regarding Lambda O2 sensors - I recently had a lambda fault code at around 161,000 miles - and discovered they have a finite life, Bosch say recomended change intrval at 155k miles!

For the OP, 11 is your pre cat O2, and 1 is you post cat O2 sensor.