Mazda 3 P0037 Fault Code: What It Means and How to Fix It
Hi everyone, I'm currently experiencing fault code P0037 on my Mazda 3. I'm not sure what this means or which sensor needs replacement. Can anyone help me understand the cause of this error and guide me through the troubleshooting steps? Thanks in advance for your input.
You didn't provide much detail, so I assumed it's a 2008 Mazda 3 with a 2.4L engine and automatic transmission. Trouble Code: P0037 (2.3L L4 Auto) - HO2S-12 (Bank 1 Sensor 2) Heater Circuit Low Input. Possible causes include: • HO2S heater control circuit shorted to chassis ground • HO2S heater damaged or failed • PCM failure. Note: A fault code does not always mean a component needs replacement — further diagnosis is required.