P2195: O2 sensor signal biased / stuck lean (Bank 1 Sensor 1)
Drive carefully. Get it checked within a week or two.
Can I drive with P2195?
Yes, but drive carefully and get it checked soon. Bank 1 upstream sensor is locked lean; engine runs rich trying to compensate.
What does P2195 mean?
P2195 stands for O2 Sensor Signal Biased/Stuck Lean (Bank 1, Sensor 1).
Symptoms you may notice
- Check engine light illuminated
- Slightly increased tailpipe emissions during the first 3 minutes of warm-up
- Normal engine performance once warmed up
How much does it cost to fix?
Repair costs for code P2195 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:
- Air intake vacuum leak or intake boot crack
- Exhaust manifold leak before the O2 sensor
- Defective upstream air-fuel ratio sensor
- Low fuel pressure or dirty injector
What to do next
- Inspect intake boot and PCV hoses for cracks.
- Check for exhaust ticking near the manifold.
- Replace the upstream Bank 1 oxygen/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 P2195 indicates that the upstream air-fuel sensor is stubbornly frozen in a lean reading. The computer injects extra fuel to balance it, which hurts gas mileage. Safe for short drives.