• Check Engine Light is on
• Increased emissions
• Poor fuel economy
• Rough engine idle
• Faulty oxygen sensor heater
• Blown fuse for the heater circuit
• Wiring issues such as open or short circuits
• Faulty ECM
ECM: Engine Control Module, the computer that controls engine functions.
HO2S: Heated Oxygen Sensor, a sensor that measures oxygen levels in the exhaust.
• P0036
• P0038
HO2S Heater Control Circuit Low Bank 1 Sensor 2
Your car has a sensor that checks how clean the exhaust is. This sensor needs to be warm to work properly, and there's a heater to keep it warm. This code means the heater isn't working well.
The P0037 code indicates that the heater circuit for the oxygen sensor located in Bank 1, Sensor 2 is not functioning properly, showing a low voltage condition.
The Heated Oxygen Sensor (HO2S) is used to monitor the amount of oxygen in the exhaust gases. The sensor has a built-in heater to help it reach its operating temperature quickly. The P0037 code is triggered when the Engine Control Module (ECM) detects a low voltage in the heater circuit of the downstream oxygen sensor (Bank 1, Sensor 2).
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage.
• Check the fuse for the oxygen sensor heater circuit.
• Test the oxygen sensor heater resistance.
• Replace the faulty oxygen sensor.
• Repair or replace damaged wiring or connectors.
• Replace the blown fuse.
• Test and replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$100 - $300
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly inspect and maintain the exhaust system.
• Ensure timely replacement of oxygen sensors.
• Check electrical connections periodically.
Sensor Issue
• Avoid ignoring the Check Engine Light.
• Consult a mechanic if unsure about repairs.
Check your vehicle's warranty for coverage on emissions-related components.
This code has been common in vehicles with aging oxygen sensors or poor electrical connections.
Moderate – While not immediately critical, it should be addressed to avoid increased emissions and potential damage to the catalytic converter.
Driving with a malfunctioning oxygen sensor can lead to increased emissions, which may not comply with environmental regulations.
• Engine at operating temperature
• Vehicle in closed-loop mode
The Bank 1 Sensor 2 oxygen sensor is located on the exhaust system behind the catalytic converter on the side of the engine with cylinder 1.
Q: Can I drive with a P0037 code?
A: While the car may still run, it's best to fix the issue to avoid increased emissions and fuel consumption.
Q: How can I prevent this code from appearing?
A: Regular maintenance and inspections of the exhaust and sensor systems can help prevent this issue.
