HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
Usually safe to drive short-term, but diagnose soon.
Quick Answer
P0031 means “HO2S Heater Control Circuit Low (Bank 1 Sensor 1).” Severity: Low. Estimated repair cost: $100 - $300. Most common sign: CEL only.
What Does P0031 Mean?
Common Symptoms
Possible Causes
How to Fix P0031 – Repair Guide
Upgrading Your Vehicle or Need Replacement Clearance?
Explore high-quality aftermarket auto parts, forged wheel spacers, and leveling kits.
Budgeting for This Repair?
A typical P0031 repair runs about $100 - $300. If you'd rather spread the cost over time, estimate the payment with our free sister tool: Car Finance Calculator (50-state sales tax, trade-in equity, full amortization).
Recommended OBD2 Scanners & Tools
To read and clear this code yourself, you need a reliable OBD2 scanner. Here are top-rated options:
BlueDriver Bluetooth Pro OBDII Scan Tool
Professional Bluetooth scanner with live data, enhanced diagnostics (ABS/SRS) and repair reports. Works with iPhone & Android. No subscription fee.
Check Price on Amazon →ANCEL AD310 Classic Enhanced OBD2 Scanner
Best-selling handheld code reader. Read & clear engine codes, live data, freeze frame. No phone required. Highly rated for beginners.
Check Price on Amazon →FIXD Bluetooth OBD2 Scanner
Simple plug-and-play sensor that explains codes in plain English via free app. Ideal for first-time users.
Check Price on Amazon →As an Amazon Associate we earn from qualifying purchases. This does not affect the price you pay.