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Old 07-27-2009, 12:50 AM   #1
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3 & 4-wire O2 sensor question
Does anyone know if a 3 or 4 wire oxygen sensor heater circuit can be powered off after the engine warms up or does it need to stay powered to maintain closed-loop mode whenever the engine is running?

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Old 07-27-2009, 05:45 PM   #2
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Re: 3 & 4-wire O2 sensor question
I have the 3 wire o2 powered key on.
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Old 07-28-2009, 02:56 AM   #3
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Re: 3 & 4-wire O2 sensor question
well, if i remember correctly the heater element inside the o2 sensor will only switch on during a specific temperature range (0-600°F or something?), so that's on startup till warmed up or during normal operation when some condition causes the o2 sensor to cool under its optimal operating temperature
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Old 07-28-2009, 02:56 AM
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