P0170 is rated as medium severity. Schedule service — affects performance or emissions.

P0170

Fuel Trim Malfunction (Bank 1)

Q: What does code P0170 mean?

Fuel Trim Malfunction (Bank 1): The fuel trim values are outside the expected range for bank 1, indicating the engine is running too rich or too lean.

Powertrain Code · Medium

What does P0170 mean?

The fuel trim values are outside the expected range for bank 1, indicating the engine is running too rich or too lean.

System: Fuel System

P0170 is a powertrain diagnostic trouble code indicating fuel trim malfunction (bank 1). This code is classified as medium severity, which means: schedule service — affects performance or emissions.

Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your vehicle.