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Home >> Ford >> 2011 >> Focus S, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Powertrain DTC Charts & Descriptions - DTC P0001 Through DTC P0217 - (Except Diesel & Hybrid) >> DTC P0172: System Too Rich (Bank 1)

DTC P0172: System Too Rich (Bank 1)

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 POWERTRAIN CONTROL SOFTWARE , FUEL TRIM for additional 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 airflow (MAF) sensor
Diagnostic Aids:  View the freeze frame data to determine the operating conditions when the DTC was set. Observe the LONGFT1 and LONGFT2 PIDs. Refer to ADAPTIVE FUEL DIAGNOSTIC TROUBLE CODE (DTC) DIAGNOSTIC TECHNIQUES , for additional information and the appropriate pinpoint test for specific concern identification.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST H .
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