Code P0037- O2 heater not working, anyone know what resistance it's supposed to be? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 06-22-2015, 09:45 PM   #1
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Default Code P0037- O2 heater not working, anyone know what resistance it's supposed to be?

New cat in the car, but rear heater circuit is giving me troubles now.

Anyone know what resistance the circuit is supposed to be, and what wires it should be?
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Old 06-22-2015, 10:01 PM   #2
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Fun fact: Until now, I never realized that there was a different spec for the O2 sensor heater resistance on front vs. rear in the '01+ cars. That's fairly unusual.
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Old 06-22-2015, 11:16 PM   #3
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Very cool, thank you. If I run a wire with a 15.7 ohm resistor, between the rear C&D, that should do it. I think.

Edit: 15.7 ohm, no such resistor exists. Maybe a 15 will work?

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Old 06-23-2015, 06:57 AM   #4
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I honestly don't know if that will work, I've never tried it.

Resistive heating elements have the characteristic that their resistance increases as they get hot, and thus the current flowing through them decreases (for a given voltage.)

If the ECU is looking for this current-curve behaviour, which it should be, it'll still throw a code.

If you wish to experiment, be aware that the resistor will dissipate around 15 watts of power, and will get very hot.
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Old 08-06-2015, 11:19 PM   #5
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The resistor worked. Just for anyone looking this up. It let me troubleshoot in a new O2 sensor.
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