rusefi_documentation/FAQ/do-i-need-wideband-oxygen-s...

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## The short answer is yes.
The longer answer is also yes. You need a wideband because a narrowband only tells you if you are RICH or LEAN, not HOW RICH or HOW LEAN. How are you going to target 13:1 AFR at wide open throttle with a narrowband? Hint: it isn't possible.
PS: if you are looking to debate or double-check anything here - please don't. You _absolutely need_ a wideband oxygen sensor.
## Q: Shall I get Innovate wideband controller?
A: rusEFI advices AGAINST Innovate wideband controllers.