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D2 - Fuel and Exhausts Everything to do with getting fuel into the engine, and fumes back out again

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  #1  
Old 5th December 2018, 06:45 PM
Markiii Markiii is online now
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Default 2002 S8 o2 sensor

Chaps,

looking to replace the pre cat o2 sensors as I don't think they have ever been done

I think its these

https://www.autodoc.co.uk/bosch/1149541

anyone confirm 100%?

thanks
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  #2  
Old 5th December 2018, 07:57 PM
MikkiJayne MikkiJayne is offline
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Looks like that's a generic 4-wire sensor so you have to splice the connector.

This one is the correct part cross referenced by the original number (077906265J), and is the same price.
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Old 6th December 2018, 10:29 AM
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cheers MK
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Old 16th December 2018, 04:58 PM
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well they arrived and look like the correct part but looks like you need the arms of Mr tickle and the hands of a newborn to get to them.

Anyone any tips or links to a guide for this job ?
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Old 16th December 2018, 08:14 PM
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steamship steamship is offline
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Quote:
Originally Posted by Markiii View Post
well they arrived and look like the correct part but looks like you need the arms of Mr tickle and the hands of a newborn to get to them.

Anyone any tips or links to a guide for this job ?
MJ is no doubt the expert on doing this, but it can be done by mere mortals as well. I did mine a couple of years ago, once I managed to find out where they were. Not sure of the correct procedure, but removed the driver side one from below. The passenger side I got to from above, but that resulted in some blood loss and bruising.
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  #6  
Old 28th December 2018, 07:56 PM
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Dropping the exhausts is probably the best solution, but it's a bit of a faf I would imagine.

If they're not generating codes, I'd be tempted to leave them. They are only used to check CAT efficiency and don't directly effect fueling in any way.
The fronts are way more important.
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  #7  
Old 29th December 2018, 01:43 PM
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its the fronts we are talking about no?
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Old 29th December 2018, 09:24 PM
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27litres 27litres is offline
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Sorry, my mistake!

The descriptions of the job made me think you were doing the rears!

The fronts are quite doable. I did mine with an offset O2 socket from memory, with a couple of socket extensions.
Definately fiddly, but I got to both from above. I think I only removed the engine cover and inlet pipe.


I thought Bosch had stopped making the sensor with the correct plug, for a sensor with a generic plug and a new plug for the harness (seriously, Bosch?).
Michaela would be replacing these quite often, so she should know.
I ended up with NTK sensors on mine.
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Current:
2001 Audi S8 - Brilliant Black with Black interior, C5 RS6 rims (whenever I actually put them on...), Solar Sunroof, Tinted side and rear glass, RNS-D, XCarLink, Bose, clunky old phone in arm rest!
2002 Audi S8 - Project
Replacement head coming arrived thanks to MJ
Silver with Black interior. All features as the '01, with the 'S' mode auto shifter. Dodgey rear tint (need to find a way to get rid of that).
Family:
2009 Volvo XC90 V8 R Design
- has a louder more obnoxious exhaust than the S8, sounds great! Love this thing - Q7 was double the price, and certainly not double the car!

Sold:
1997 Audi A4
- Hamilton's Club Sport, Achat Grey (will miss the old girl)

Last edited by 27litres; 29th December 2018 at 09:54 PM.
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  #9  
Old 4th January 2019, 10:43 PM
Tjalling Tjalling is offline
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Would be smart if I replace those aswell when i have my engine out of the car
It sucks that I need 4 of those
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