P2196: O2 sensor signal biased / stuck rich (Bank 1 Sensor 1)
Drive carefully. Get it checked within a week or two.
Can I drive with P2196?
Yes, but drive carefully and get it checked soon. Bank 1 upstream sensor is locked rich; computer cuts fuel causing possible hesitation.
What does P2196 mean?
P2196 stands for O2 Sensor Signal Biased/Stuck Rich (Bank 1, 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 P2196 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:
- Leaking fuel injector on Bank 1
- Stuck open EVAP purge valve
- Defective upstream air-fuel ratio sensor
- High fuel rail pressure
What to do next
- Check EVAP purge valve for unmetered fuel vapor flow at idle.
- Inspect spark plugs for rich fuel smell.
- Replace the upstream Bank 1 air-fuel 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 P2196 means the sensor reports rich continuously. The computer reduces fuel delivery in response. Drive with care to prevent stalling.