HO2S Heater Control Circuit Low (Bank 1 Sensor 2)

What does P0037 mean?

P0037 stands for HO2S Heater Control Circuit Low (Bank 1 Sensor 2). The engine computer has found a problem with how fuel and air are measured or mixed. This affects fuel economy, emissions and sometimes how smoothly the engine runs.

Powertrain codes cover the engine, transmission and emissions. When the car's computer sees a reading outside its normal range, it stores this code and may turn on a warning light on the dashboard.

Common causes

• Vacuum or intake air leaks
• Dirty or faulty mass airflow (MAF) sensor
• Faulty oxygen sensor or its wiring
• Fuel pressure problems (pump, filter or regulator)
• Clogged or leaking fuel injectors

What to do

1. Read all stored and pending codes with a scanner. Several codes together often point to one cause.
2. Note the freeze frame data (speed, temperature, load) recorded when the code was set.
3. Inspect the wiring and connectors of the part named in the code for damage, corrosion or looseness.
4. Fix the most likely and cheapest cause first, then clear the code and drive to see if it comes back.

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Frequently asked questions

What does P0037 mean?

P0037 means “HO2S Heater Control Circuit Low (Bank 1 Sensor 2)”. It belongs to the fuel and air metering group: The engine computer has found a problem with how fuel and air are measured or mixed. This affects fuel economy, emissions and sometimes how smoothly the engine runs.

Is it safe to drive with P0037?

You can usually drive carefully for a short time, but fix it soon to avoid further damage or higher fuel use.

How do I clear P0037?

Fix the cause, then clear the code with an OBD2 scanner or app. If the fault is still there, the code will come back.

Related codes

• P0033Turbo Charger Bypass Valve Control Circuit
• P0034Turbo Charger Bypass Valve Control Circuit Low
• P0035Turbo Charger Bypass Valve Control Circuit High
• P0036HO2S Heater Control Circuit (Bank 1 Sensor 2)
• P0038HO2S Heater Control Circuit High (Bank 1 Sensor 2)
• P0039Turbo/Super Charger Bypass Valve Control Circuit Range/Performance
• P003ATurbocharger/Supercharger Boost Control A Position Exceeded Learning Limit
• P003BTurbocharger/Supercharger Boost Control B Position Exceeded Learning Limit

Code meanings can vary by manufacturer. This page is general guidance, not a repair manual. Always confirm the cause before replacing parts.