P2099 Code Definition
P2099 Post Catalyst Fuel Trim System Too Rich (Bank 2)
What Does the Engine Code P2099 Mean?
Character "P" in the first position of Diagnostic Trouble Code (DTC) represents the powertrain system (engine and transmission), "2" in the second position means that this is a ISO/SAE controlled OBD-II (OBD2) DTC. "0" in the third character position in a DTC indicates that the fuel and air metering and auxiliary emission controls is experiencing a malfunction. The last two characters "99" is DTC number. OBD2 Diagnostic Trouble Code P2099 means that Post Catalyst Fuel Trim System Too Rich (Bank 2) has been detected.
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How Serious Is the Code P2099?
This issue is not critical yet. Make sure that it is current and fix it early before this leads to more severe issues.