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Re: How many O2 sensors on an `01?
There are 2 catalytic converters in the exhaust sytem. Each has a sensor "before", and a different sensor "after".... a total of 4 sensors.
But why would you want to change them? Unlike sensors of a decade or so back, they are not to be changed as a maintenance routine. If they begin to fail, the on-board diagnostic system (OBDII) will give you a code ("engine light") identifying a related failure.
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