P0038 — HO2S Heater Control Circuit High (Bank 1 Sensor 2)
Category: Powertrain Severity: Low
Updated:
DTC code P0038 means: HO2S Heater Control Circuit High (Bank 1 Sensor 2). It falls under the "Powertrain" category, with an estimated severity of Low. Common causes include shorted sensor heater, control wire shorted to voltage and damaged connector; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Shorted sensor heater
- Control wire shorted to voltage
- Damaged connector
- ECU driver fault
Symptoms
- Check engine light
- No drivability symptoms
How to diagnose it step by step
- Measure the heater.
- Check the wiring.
- Replace the sensor if shorted.
How to fix it
Measure the heater: near-zero resistance means an internal short and the sensor must be replaced. Also check the wire is not touching a voltage source.
Estimated repair cost
$100–280.
Frequently asked questions
What does DTC code P0038 mean?
HO2S Heater Control Circuit High (Bank 1 Sensor 2).
Is code P0038 serious?
Severity Low. Usually a minor fault; check the causes listed.
Can I keep driving with code P0038?
Yes, it is safe to drive.
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