P0158: Downstream O2 sensor high voltage (Bank 2 Sensor 2)
You can keep driving. Get it checked when convenient.
Can I drive with P0158?
Yes, you can keep driving. Bank 2 downstream sensor voltage high; vehicle drives normally without engine risk.
What does P0158 mean?
P0158 stands for O2 Sensor Circuit High Voltage (Bank 2, Sensor 2).
Symptoms you may notice
- Check engine light on with no noticeable change in how the car drives
- Vehicle fails state emissions smog test
- Normal engine power and shifting
How much does it cost to fix?
Repair costs for code P0158 depend on the specific underlying root cause, ranging from simple DIY checks to component replacement. The table below lists the most common causes and rough price ranges in USD:
- Internal short in rear sensor
- Heater circuit wire shorting to signal wire
- Corrosion in undercarriage plug
- Very rich exhaust from upstream problem
What to do next
- Check wiring harness for pinching or melting.
- Test downstream sensor voltage with scan tool.
- Replace Bank 2 Sensor 2.
Last updated: October 2026
Related codes
General guidance only, not a professional diagnosis. If the check-engine light is flashing, or the car is running rough, overheating or losing power, stop driving and get help.
About this code
Code P0158 affects only the post-converter sensor on Bank 2. Safe to drive for a short time, but get it checked.