DTC P2197: Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Signal Stuck Lean: General Description

When the front air/fuel ratio (A/F) sensor (bank 2, sensor 1) is properly connected to the engine wire harness, but it is not installed in the exhaust pipe, the A/F feedback is not done properly even if the front A/F sensor is active after starting the engine. Thus, the exhaust emissions increase.

When the front A/F sensor output stays out of the normal range after the front A/F sensor becomes active, the engine control module (ECM)/powertrain control module (PCM) detects that the front A/F sensor is not properly installed and a DTC is stored.