DTC P0037 Or DTC P0038: Condition
WARNING: This page is about a different car, the 2002 Suzuki Vitara. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0037 is set when Engine Control Module (ECM) detects Heated Oxygen Sensor No. 2 (HO2S-2) heater circuit voltage input is higher than 13.63 volts while HO2S-1 heater is ON. DTC P0038 is set when ECM detects HO2S-2 heater circuit voltage input is lower than 0.70 volt while HO2S-2 heater is ON. MIL is illuminated when ECM detects malfunction during 2 consecutive drive cycles. Possible causes are:
- ECM malfunction.
- HO2S-2 heater circuit malfunction.
- HO2S-2 heater malfunction.