to be honest used knock sensors might get you by, but it would fail on you sooner than a brand new one. i just bought a bosch knock sensor for like 80 bux cuz i know the guy who owns 24/7parts.com, but you can get a new knock sensor for like 100-120 depending on the brand. i would go oem bosch but thats just me. oh yeah supposedly knock sensors need to be replaced every 6-8 years any way. so who knows how old the used one you buy is. its there to save your motor, why cheap out? good luck.
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