My apologies if this is a repeat of info already out there, but I thought it might help someone along the way. After cursing and crying for an hour or so last weekend trying to replace my B1 (passenger side - LHD, forward sensor) using conventional O2 socket and various wobble extensions and oddities, I finally gave up and decided to chew on it. Found a crow's foot O2 socket for $10US at AutoBone... Brand = OEM, PartNo. = 25249. It was a 15 minute job start to finish (including hand washing and opening of adult beverage) with that tool.

This link is for a wholesaler, but this is the tool... http://www.greatnecksaw.com/product_...oducts_id=7550

HTH,

JJJ
'99 A6 Avant, 2.8L - Bone stock, 135k miles

 

I got that tooli wouldn't do O2 sensors without it.

 

AutoZone will even loan you that tool for free!