What does p209600 exhaust exceeding lean control limit mean?

[McAshley]

p209600 exhaust exceeding lean control limit is caused by an excessively lean air-fuel mixture, and the control unit has exceeded its adjustment range. Below is an introduction to automotive exhaust-related content: 1. Establishing standards: Automotive exhaust emission standards are quality requirements set to reduce harmful gas production, prompting automobile manufacturers to improve technology regarding emissions of carbon monoxide, hydrocarbons, nitrogen oxides, particulate matter, and other harmful substances. Both Europe and the United States have established relevant standards, while mainland China primarily adopts European standards. 2. Air pollution: Automotive exhaust is another major factor in air pollution, containing carbon monoxide, nitrogen oxides, and other solid particles that adversely affect human health, especially leaded gasoline, which poses greater harm. Different vehicles also emit distinct odors. Automotive repair experts note that normal exhaust should be colorless and odorless, while exhaust of different colors or unusual smells may indicate potential vehicle malfunctions.