[Diy_efi] Standard HEGO heater power question

[Eric Fahlgren]

dclark at zeiss.com wrote:
> 
> Quick question about the heater on a standard (non WB) HEGO; can the heater
> be run right off of the battery, or does it also need a regulated power
> supply?

Hi Darren,

They're self regulating.  They've got something like a big PTC
resistor as the heating element, so when they get hot the current
requirements drop automatically.

Eric

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