P0030 O2 sensor heater control circuit

What is your question?

What would the likely cause be? I have tested voltage (gets 5 volts). I thought it was supposed to receive 12, but when I supply it with 12, I get a different code indicating voltage too high. Disconnected that wire and we're back to the original P0030 code. What should I check next?

Skibum42 in Portage IN

Nov 5, 2016

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