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Old 10-23-2013, 12:01 AM   #1 (permalink)
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Default P0031 HO2S - 2005 Swift (RS415)

Hi All,

I have a 2005 Suzuki Swift RS415 and recently the CEL came on.
The fault code came up as DTC P0031 - HO2S Heater Control Circuit Low (Bank 1 Sensor 1).

I've been doing my research and I understand its a fault with the Heater element circuit in the O2 sensor.

I'm going to start diagnosing the problem soon but need to know:

1. Is "Bank 1 Sensor 1" the O2 sensor in the manifold (pre-cat)

2. How many Volts does a good heater circuit operate at, 12v?

3. How low does the voltage have to drop before the ECU throws a CEL?

4. What is the factory spec resistance on the heater element in the O2 sensor?

Any help appreciated. I'd much prefer to figure out the problem rather than throw parts at the car

Cheers

Last edited by dorikin; 10-23-2013 at 12:11 AM.
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Old 10-25-2013, 03:41 PM   #2 (permalink)
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The heater is a ceramic PTC element so the resistance changes with temperature. If the voltage is low then I would expect the element to be short circuit.
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