DiodeBoy is correct. A sensor socket allows you to use a 3/8" ratchet (with cheater bar, extensions, and U-joint, in the case of the Bank 1 Upstream sensor) to remove and install the sensors. I believe you'll find downstream sensor replacement easier with the car on ramps, at least.
I assume your Check Engine light was on. What trouble codes were in the computer? If the dealership didn't tell you, go to Autozone or similar and ask them to pull the codes for you.
Without knowing your car's trouble codes, for all we know your dealer is bull****ting you.
Last but not least, it is worth noting there are actually four sensors: upstream and downstream for each of the two cylinder banks. They are called HO2Sxy, where x indicated the cylinder bank number (bank 1 is closer to the firewall), and y indicates upstream (1) or downstream (2). HO2S11 seems to be the most frequently-mentioned of them all (I replaced mine last year; there's a wealth of info available via Search).
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Garrick
Silver E0, #3895 of 6535, built 10/2/97
She's stock. Why mess with a good thing?
