What does P209600 exhaust exceeding lean control limit mean?

[VanPeter]

P209600 exhaust exceeding lean control limit indicates that the exhaust has exceeded the lean limit. This phenomenon suggests that the air-fuel mixture is too lean, and the control unit has exceeded its adjustment range. It is recommended to connect a fault diagnostic tool to comprehensively read and analyze the mixture data to determine the cause of the fault. If the fault code is not cleared correctly, the following issues may occur: 1. Loss of 'experience memory' in the control computer of certain vehicle models: Most vehicle models' central computers have memory functions. After disconnecting the negative ground cable of the battery, the engine operation experience data stored in the random access memory will be lost, resulting in poor vehicle performance for a considerable period after repair, or the reappearance of previously cleared fault codes after driving for a while; 2. Loss of certain functions: For example, audio locking is one of the more common issues. In this case, restoring the normal function of the audio system requires decryption, which is a very troublesome process.