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On all of my race engine setups (Haltech and MoTec) we always powered on the O2 sensor when the ignition was turned on. Common practice was to turn on the ignition and wait at least 30 seconds before starting the car.
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Scott Winders
PCA GT3 #3
2021 & 2022 PCA GT3 National Champion
2021 & 2022 PCA West Coast Series GT3 Champion
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