Quote:
Originally Posted by yoslow
Adding another option to this list: purchasing generic Bosch O2 sensors, and splicing the connection from your old setup. This setup would cost ~$43.07 USD (each), but requires a set of DIY hands; personally prefer the premium for a plug and play application.
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Not worth the hassle, I did that before on my old E90 and I wouldn't go through that again with the M3. Thankfully the O2 sensors haven't gone up at all in comparison to the ignition coils.