Location of O2 Sensor on a Bora V5?

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Originally Posted by Manaz

For what it's worth, this description came straight from the graphics in my Bentley Manual, and so is probably as accurate as you'll get without getting up under a car to check it out.

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Thanks! Although the Bentley Manual doesn't cover the V5 does it?

If I do have two O2 sensors I wonder which one the VAG-COM is reporting the fault from? The one I bought from ECS is the universal one so I guess could replace either. I will look for one before the cat and change that, if there is a second one and I still get the error then I will have to order another!

Will be tackling this at the weekend, seeing as there is not much knowledge on this subject I will take photos and do a DIY thread.

Adam

Right, so it appears the answer to my original question here is .... 4!!

I got the car up on the ramps this afternoon and slid myself under to see where I could see the sensor, found 2 around the cat, 1 just before and 1 actually in the cat. Here's a photo looking up at the cat:

http://www.rybky.com/CarPics/O2Sensors.jpg

So, having only ordered 1 new O2 sensor I did a bit more research and discovered a) on a V5 there is allegedly 4 sensors (2 on the downpipe and 2 around the cat, and b) the S2 in the fault code means the second one of the cat, S1 being the first one.

One important note, they are both in an extremely difficult location to get to with any normal tools!! Now I know why ECS sell a couple of special tools for this. Which of course I didn't buy.

As it happens, I ran the VAG-COM diag again and there are no faults being shown at all. So as this specific error appears to be very common, as revealed by a web search earlier, I have decided to leave it for now. I don't believe the fault code means it has failed, it is just a bit sleepy.

I am convinced now that the rough idle is being caused by a vacuum leak which I can't locate. Will have to take it to an expert for that.

Hopefully the above will help others as there seems such little info anywhere about this.

Adam

Thanks for the pics Adam, I'm sure it will be usefull to others.

Whenever I skimp on special tools, I end up cutting my hands and arms and ego to pieces.
I just keep telling everyone that I love a challenge ;)

Unintentional bump to this very old thread, but I thought I would add that I'm pretty sure most OBD2 VAG cars have dual O2 sensors.

I know this was the case with Ibizas... OBD1 cars had one, and OBD2 cars had two, funnily enough.