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andy - the heaters are part of the O2 sensors.
FYI, theres is an O2 sensor heater circuit that runs through a relay in the trunk. again, when i had this issue, the heater on ONE of the O2 sensors was bad & it threw codes for all four.
FYI, a scanner still showed this sensor as functional. one has to physically measure impedance across the heater at the O2 sensor to be sure it works.
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