First of all, OEM for replacement parts is always a good idea for the BMW in your life. It does suck that they're expensive, but the recommended replacement timeframe by BMW for your O2 sensor is 100k miles. So yes you spend a little extra, but you get a part that will last 100k miles at least. Replacing them is pretty easy, if you've got the tools and some minor experience. Or just YouTube and the tools. It takes about 30 minutes to put the parts in, but you then have a vehicle that runs smoothly and well. I do recommend taking your time to get a proper diagnosis for your car or you diagnose your car so you're not just throwing parts at it to fix the problem. But overall the part fits perfectly and runs remarkably well after replacement. There is also this to remember. For your BMW specifically, and that is there are specific parts for bank one and two aka front and rear. Don't skimp, if you want your car to run well you need to buy the specific part not a general "universal" O2 pre cat sensor. 05 BMW X3 3.0i auto transmissionRead full review
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Sure, you can buy the Ch#nese ones for about a third of the price but guess what'll happen a couple of months in? Thats right, the heater element will fail and you'll get bad sensor codes....which is a real pain because without a clear computer reading you can't get your car smogged. Ask me how I know this! Some things you CAN cheap out on, O2 sensors aren't where you should be looking.
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OEM oxygen sensor for BMW's. High quality. Fit its a german made car you should use Bosch O2 sensors. You just need to look up which one is right for your car.
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Same OEM product as other places for a little less
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OEM part, good quality, as described.
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