I have a bad Oxygen sensor in my 2016 L405 and was wondering if the after-market sensors, Bosch etc are as good as the OEM? I also read they recommend replacing them in pairs??They sure are a lot more expensive. Thx in advance!

Fuel delivery, air flow sensors and exhaust sensors are probably one of the areas that benefit from genuine parts to be honest.

I’ve tried various non genuine in different cars in the past and they’ve often had issues that were fixed by getting the real thing.

Other areas are fine with aftermarket, but fuel/emissions are so accurate that it’s probably worth it in the long run. V8 or else ...

Thanks Fish, much appreciated!

Are not most OEM parts made in China ? Several post on here and other marques with owners and dealers waiting for that slow boat! 2018 SE SDV8 4.4 Byron Blue

Re-reading the op, regarding aftermarket part brands, as long as you could be satisfied that a part is genuine Bosch, then it’s is probably one brand which I would think is likely to be OK as an alternative. I was speaking more about the brands which you’ve not likely heard of . V8 or else ...