P0037 — HO2S Heater Control Circuit Low (Bank 1 Sensor 2)
Category: Powertrain Severity: Low
Updated:
DTC code P0037 means: HO2S Heater Control Circuit Low (Bank 1 Sensor 2). It falls under the "Powertrain" category, with an estimated severity of Low. Common causes include open downstream sensor heater, blown fuse and wire broken or shorted to ground; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Open downstream sensor heater
- Blown fuse
- Wire broken or shorted to ground
- Damaged connector
Symptoms
- Check engine light
- No noticeable symptoms
How to diagnose it step by step
- Measure the heater.
- Check the fuse.
- Check the wiring.
- Replace the sensor if open.
How to fix it
Measure the downstream sensor heater resistance; if it is open, replace it. If it is fine, check the fuse and wiring.
Estimated repair cost
$100–280 with the sensor installed.
Frequently asked questions
What does DTC code P0037 mean?
HO2S Heater Control Circuit Low (Bank 1 Sensor 2).
Is code P0037 serious?
Severity Low. Usually a minor fault; check the causes listed.
Can I keep driving with code P0037?
Yes, it is safe to drive.
Related codes
P0036 P0038 P0031 P0030 P0045 P0046 P0021 P0019 P0018 P0017
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