Quote:
Originally Posted by SpadedOne
Would bad O2 sensors and/or the exhaust leak cause really the bad gas milage?
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quite simply, yes... If there is an exhaust leak and extra "fresh" air is hitting the 02 sensors, they send a signal to the ECU saying that the motor is running "lean". In turn, the ECU sends signals to the injectors to put more fuel in. There's probably what is in fact happening. It can and will kill your gas mileage. Fix the leaky exhaust first, then clear the codes by unplugging your battery overnight and you may get lucky that the O2 sensors are fine but they are just seeing readings that are haywire so the ECU is signalling a code. Hope that helps explain it a little
