P0154: Upstream O2 sensor circuit no activity (Bank 2 Sensor 1)
Drive carefully. Get it checked within a week or two.
Can I drive with P0154?
Yes, but drive carefully and get it checked soon. No signal detected from Bank 2 front sensor; engine operates in open-loop backup mode.
What does P0154 mean?
P0154 stands for O2 Sensor Circuit No Activity Detected (Bank 2, Sensor 1).
Symptoms you may notice
- Drop in gas mileage by 10% to 15%
- Slight hesitation or sluggish response when accelerating
- Check engine light illuminated
How much does it cost to fix?
Repair costs for code P0154 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:
- Failed Bank 2 oxygen sensor
- Disconnected harness connector
- Blown sensor heater fuse
- Cut sensor wire
What to do next
- Inspect the Bank 2 sensor wiring plug.
- Check O2 sensor fuses in engine fuse box.
- Replace Bank 2 upstream oxygen sensor.
Last updated: October 2026
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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 P0154 means Bank 2 Sensor 1 voltage is stationary. Driving is safe, but replace the sensor to restore fuel trimming.