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Old 11-29-2009, 02:13 AM   #3 (permalink)
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It wouldn't work on pre-OBD2 cars, and I think some of the OBD-2a versions still didn't have heated sensors.

While heating the sensor surely will have some effect on mippigs, it'll be well within the noise of day to day variation, and unable to be tested without serious testing procedures. The O2 feedback sensors have very little overall effect on AFR compared to the other sensors in the control loop.
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