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AEM wideband question

Understanding AFR

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I have one of the AE UEGO widebands installed on my 2009 Mitsubishi Lancer Ralliart. In the documentation, it says there is no need to ever do the free air calibration. Would you recommend doing this anyway, or do I really not need to calibrate it?

I have been using it for 2 years. No calibration needed.

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