Conditions for Running the DTC

WARNING: This page is about a different car, the 2007 Isuzu i-370, 2007 GMC Canyon, and 2007 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P0641, P0651, P1516, P2101, P2119, and P2176 are not set.
The engine is running and the engine speed is more than 600 RPM.
DTC P0121 runs continuously when the above conditions are met.