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I actually found out the sensor was going through some other strange behavior the car was having. These sensors especially the one you’re talking about downstream affect timing fuel trims etc., the first indication I had a problem was in the very cold Minnesota weather at high-speed acceleration I noticed a momentary hesitation but no CEL. I then started logging ignition timing and fuel trim data and noticed some really odd things. The car was still under warranty so I took it in and they literally went crazy on it, replacing injectors coil‘s turbo parts etc., later I actually found the failing O2 sensor again through real time data logging. I eventually got a super knock code and CEL, which is a potentially disastrous problem.
My suggestion is to replace it with OEM. It’s definitely causing you other problems you’re not seeing, certainly lower fuel economy.
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