Causes and Fixes P0170 Code: Fuel Trim Bank 1

How to fix P0170 Code: Fuel Trim Bank 1
Fuel trim is the adjustment made by a vehicle’s Engine Control Unit (ECU) to maintain the optimal air-fuel mixture for combustion in the engine.

Types of Fuel Trim
Fuel trim is expressed as a percentage and comes in two forms:
Short-Term Fuel Trim (STFT):
Immediate, real-time adjustments to the fuel mixture.
Responds to temporary changes, like acceleration or idling.
Values fluctuate rapidly as the ECU reacts to sensor inputs.

Long-Term Fuel Trim (LTFT):
Accumulated adjustments based on trends over time.
Accounts for consistent issues, like a vacuum leak or faulty sensor.
Stabilizes the baseline for STFT corrections.

A Rich or Lean condition exists if the engine Air/Fuel Ratio is off.
Bank-1 Sensor-1 oxygen sensor reads the amount of oxygen burnt off during combustion and reports the information to the computer.
P0170 code can sometimes be problematic to fix since it can be caused by several things.

Possible Causes of a P0170 Code:
Oxygen Sensor (Bank 1 Sensor 1)
Bad Fuel Injector

(V6/V8 Engines) Other Possible Causes but Usually Would also Cause Bank-2 Issues (P0173 - P0175 Codes)
Bad Mass Air Flow Sensor or Other Sensor
Vacuum Leak
Blocked Air Intake
Bad Fuel Pressure Regulator or Fuel Pump

By using this information, the user assumes all risks of use.