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Message: <blockquote data-quote="Mouse" data-source="post: 183586" data-attributes="member: 2204"><p>one of the E46 maintenance list online recommend changing O2 sensor at 75K miles coz they say its prone to failure around that age. i think it cost around 450. is yours E46 and how much did u change your camshaft sensor? Btw, my car just reach 100K n i have ask my mechanic about the O2 sensor coz i feel like changing it too, but like albundy mention, he says that if your fuel consumption is normal, your idling is fine and your car does not have power loss out of a sudden, then no need to change. the engine light icon may also appear in your dash display if something wrong with your sensor. we just need to monitor</p></blockquote><p></p>