Lambda sensors - Where, Why and how Much ?

["Malcolm Robb, LC 0112G" <Webmaster@lotus-carlton.fsnet.co.uk>]

Hi all,

I think my car may need new Lambda sensors. The ECU is a GMP4 1228331, - 
same as in the ZR1 - and the car is fitted two, four wire jobbies. Just 
been done the local GM dealer, and they want about 100 quid - ($160) EACH 
!!!!!  Of course, all I can get from the dealer is the Vauxhall/Opel part 
number, so I have no way of crossreferencing with Delphi/Bosch/Lucas etc to 
get a better deal. So

Question 1. Are all 4 wire Lambda sensors basically the same, so it doesn't 
matter which manufacturer I choose ? Even after market ones cost 50 quid 
($80) each, so its an expensive mistake if I get it wrong.

Question 2. Anybody got any Bosch or Lucas part numbers that are known to 
work with the GMP4. Delphi part numbers also welcome, but it is usually a 
problem to order direct from Delphi here in the UK - they often make you go 
to Vauxhall.

TIA
Malcolm Robb, LC 0112G

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