Is the NTK sensor you put in a zirconia sensor, or is it a titania sensor? What are the lead colors and how are you determining it isn't getting heated? What is the resistance of the heater cold, and what is it hot (if only from exhaust)? How did you adapt the Volvo-specific Bosch harness to the NTK? Many questions, maybe a few pictures would answer, if no other way.
The 89 240 didn't "control" the heater for the oxygen sensor. It just feeds it 12V whenever the motor is running.
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Art Benstein near Baltimore
What engineers say and what they mean by it:
Engineering says: "Essentially complete."
Engineers meant: Half done.
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