HO2S Heater Control Circuit Low Bank 1 Sensor 2

Where it lives

For P0037, the circuit described runs through the sensor. The description of P0037 puts it on bank 1.

Check these first

• A short to ground in the bank 1 sensor 2 heater wire
• A failed bank 1 sensor 2 oxygen sensor heater
• Low battery voltage at the heater circuit
• Corrosion at the bank 1 sensor 2 connector
• A failed ECM driver holding the heater circuit low

What to do next

1. Inspect the bank 1 sensor 2 heater wiring for a short to ground
2. Measure the bank 1 sensor 2 heater resistance
3. Check battery voltage and charging output
4. Unplug the sensor and watch for the low code to clear
5. Replace the bank 1 sensor 2 oxygen sensor if the heater is shorted
6. Clear the code and retest

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