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Where is the o2sensor heater circuit at on 2000 Toyota Tundra?
Wiki User
∙ 14y ago
The O2 sensor heater circuit helps warm up the O2 sensor. The purpose of this is to allow O2 sensor to get to normal operating temperature without having to wait for exhaust pipes to warm up so it can give accurate readings. It is built into O2 sensor.
Wiki User
∙ 14y ago
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