Change intervals...definitely something proposed in the aftermarket world, for tuning purposes. Cobb tuning told me years ago to replace the WB 02S in my MS6 before bringing in back to be tuned. It was fouled and reporting inaccurately. But, it's not like a maintenance item you see Ford place in the owners manual.
They do fail. Perhaps not as susceptible as sensors for engines past. But also, consider the inherent richness of DI burn. The soot on tailpipes? And I've seen discussion here of oil leaking past turbo seals and burning into the exhaust on the engines. These produce particles which can foul a sensor. Not to mention they can potentially just fail outright.
I can see the benefit of using feedback under load, say, if fuel pressure drops (for whatever reason) and is unable to maintain demand. In this scenerio, if the engine were at the mercy of open loop fueling, it could have catastrophic consequences. Definitely an advantage in that situation, to have the feedback. But, if a sensor is grossly inaccurate of fails outright under heavy load, it can have the same results! XD
Anyway, it is just surprising to see from an OEM. I wasn't aware this was taking place, or that the EB was utilizing it. Pretty sweet. It explains things that I never understood. For example, the gains on E, with stock tuning.
By the way, since I've seen the topic of discussion in here involve fuel brands, Shell is rolling out a new proprietary additive formulation. The conversion is taking place now. Not sure how it differs. But, seems important, considering the proprietary additives are the only thing which makes a blend stock gasoline "branded".
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