P0121 Code Definition
P0121 Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance
What Does the Engine Code P0121 Mean?
Character "P" in the first position of Diagnostic Trouble Code (DTC) represents the powertrain system (engine and transmission), "0" in the second position means that this is a generic OBD-II (OBD2) DTC. "1" 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 "21" is DTC number. OBD2 Diagnostic Trouble Code P0121 means that Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance has been detected.
Carly Universal Scanner
How Serious Is the Code P0121?
For now, this issue is not serious. Carly recommends you to check this issue on a regular basis and check if it gets worse later on.
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