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O2 sensors become lazy over time. They do not respond as quickly as they do when they are new. If you have a graph plot of them when new, you'd most likely be able to tell the difference, however, just looking at a graph of old O2 units probably wouldn't give you a clue because you'd not have anything to compare it to. Being lazy, the O2 units do not provide ...


It may be anecdotal or marketing hype. I did see a demonstration where they compared sensors with 80,000 miles on them with their Brand X new units. While the final results were the same the new units reacted faster than the originals.

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