How to fix P2197 engine code: O2 Sensor Signal Biased/Stuck Lean (Bank 2, Sensor 1)
A P2197 Code is set when the Bank-2 Sensor-1 upstream oxygen sensor reports a lean air-fuel mixture.
A lean condition exists if the engine is getting more air than fuel in the cylinders than there should be. (Air/Fuel Ratio is wrong)
If there is a lean condition, it can be problematic since it can be caused by many things.

How To Test Upstream Oxygen Sensor 1 Video: [ Ссылка ]

Possible Causes of a P2197 Code:
Bad Oxygen Sensor (Bank-2 Sensor-1)
Wiring (Open Short)
Exhaust leak
Intake Air Leak
Lean Running Condition (MAF/MAP Sensor, Injector, Fuel Pump - Usually Will Have Other Codes)

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