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Maintenance, Engine & Driveline TechThis forum is brought to you by The Speed Syndicate (TSS) in Burnaby. Discussion of maintaining your engine, transmission, differentails, rear ends, and mods associated with "driveline" parts..
while it's easy to just replace the sensor for the 2nd one since it's not working as well as the first one since it's not reading as fast anymore, you should see why it failed if it's relatively low mileage.
2nd sensor could be failed because of a broken cat, and the 1st one could've failed because of an exhaust leak causing it to think lean and make the engine run leaner, throwing more fuel and burning out the cat.