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P0172 – System Too Rich (Bank 1)

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P0172 – System Too Rich (Bank 1)
Description:         The adaptive fuel strategy continuously monitors the fuel delivery hardware. The test fails when the adaptive fuel tables reach a lean calibrated limit. Refer to Section 1, Powertrain Control Software Fuel Trim for more information.
Possible Causes:       
Fuel System:
Leaking fuel injectors
Fuel return line restricted
Fuel rail pressure (FRP) sensor bias
EVAP canister purge valve is leaking when the canister is full Base Engine:
Engine oil contamination Intake Air System:
  Damaged or contaminated mass air flow (MAF) sensor
Related Topics  P0192 - Fuel Rail Pressure Sensor A Circuit Low

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