I have always been led to believe that if one sensor needs replacing, both should be done at the sametime. I don't have any direct experience, but working on the principle that both sensors will have done the same mileage under the same conditions, I can see the logic behind it.
Hope you get it sorted without too much hassle.
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2001 V40 2.0lt Sport lux - Daily Driver. 174k miles.
2003 C70 2.4 GT Convertible - Garage Queen. 65k miles.
http://www.neptuno6benagil.com
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