P0031Medium Priority
Heated Oxygen Sensor (HO2S) Heater Circuit Low Voltage Bank 1 Sensor 1
Category: Powertrain• Fuel and Air Metering
2 articles · 2 makes affected
What is P0031?
Heated Oxygen Sensor (HO2S) Heater Control Circuit Low (Bank 1 Sensor 1). Low voltage detected in the heater circuit of the upstream oxygen sensor, preventing proper sensor operation.
Symptoms You May Notice
- ●Check engine light
- ●Extended warm-up time
- ●Poor fuel economy
- ●Rough idle when cold
How to Fix It
- ●Replace upstream O2 sensor ($100-$300, intermediate)
- ●Repair wiring short to ground ($100-$300, intermediate)
- ●Check and repair blown fuse ($5-$30, beginner)
Owner Statistics
Based on 102,877 real owner discussions • 2530 confirmed solutions
$1,915
Average Repair Cost
2%
Success Rate
27%
DIY Repairs
102,877
Data Sources
About This Data
Statistics are aggregated from real owner discussions on Reddit, automotive forums, and YouTube comments. All data is anonymized and represents actual repair experiences reported by vehicle owners.
Frequently Appears With
These codes often appear together in owner reports. Check these if you see P0031.
Based on analysis of 3 owner reports where multiple codes appeared together.