P0154 Code: O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
🟠 Moderate severity · drivable
Drivable, but the computer has no fuel-control feedback on bank 2, so economy and running will suffer.
What P0154 means
The bank 2 upstream oxygen sensor is producing no usable signal at all. The computer is running bank 2 without its primary fuel-control feedback.
Symptoms
- Check engine light is on
- Poor fuel economy
- Rough running
- Possible failed emissions test
Common causes
- most common: Faulty upstream oxygen sensor (bank 2)
- common: Open or damaged sensor wiring
- less common: Loose or corroded sensor connector
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the bank 2 upstream oxygen sensor | Yes | $60–200 |
| Repair open sensor wiring | Mechanic | $50–150 |
Frequently asked questions
Can I drive with a P0154 code?
Yes, but the engine is running without fuel-control feedback on bank 2. Fix it soon.
What is the most common cause of P0154?
A faulty bank 2 oxygen sensor or damaged wiring.
How much does it cost to fix a P0154?
Typically $60–$200 for a new oxygen sensor.
Related codes
P0150
P0150 Code: O2 Sensor Circuit Malfunction (Bank 2 Sensor 1)
P0153P0153 Code: O2 Sensor Circuit Slow Response (Bank 2 Sensor 1)
P0134P0134 Code: O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.