P0139 Code Definition
P0139 O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
What Does the Engine Code P0139 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 "39" is DTC number. OBD2 Diagnostic Trouble Code P0139 means that O2 Sensor Circuit Slow Response (Bank 1 Sensor 2) has been detected.
Carly Universal Scanner
How Serious Is the Code P0139?
This issue is not critical yet. Make sure that it is current and fix it early before this leads to more severe issues.
*Every car is unique. The Carly Features that your car supports depend on the model, build year, hardware, and software in the car. Plug the scanner in the OBD2 port, connect to the app, run your first diagnostics, and check which features are available for your car. Also, keep in mind that any information provided on this website is for informational purposes only and should be used at your own risk. Mycarly.com is not responsible for any errors or omissions, or for the results stemming from the use of this information.