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In my opinion the pre-heater is not a big deal. The role of the pre-heater is to warm up the O2 sensor faster so that it starts reading and sending a signal to the ECU. Once the ECU gets a signal it can respond and not use a default value. As I understand it this is mostly for reduced emisions and only plays a role for the first five minutes or so (although I suppose it could be a bit longer in extreme cold)
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