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# Q: Do i need wideband oxygen sensor?
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## The short answer is yes
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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.
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PS: if you are looking to debate or double-check anything here - please don't. You _absolutely need_ a wideband oxygen sensor.
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## Q: So I need it for initial calibration, what about once calibration is done?
A: With weather changes and life happening it's better to keep the wideband and enjoy rusEFI closed loop fuel correction functionality.
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## Q: Shall I get Innovate wideband controller?
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A: rusEFI advices AGAINST Innovate wideband controllers.
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[WBO ](WBO )
