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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 753 (Engine Controls - Powertrain DTC Charts & Descriptions - CNG, Flex-Fuel & Gasoline) >> Diagnostic Trouble Code (DTC) Charts >> P0172: System Too Rich (Bank 1)

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 FUEL TRIM for more information.
Possible Causes:  Fuel System
  • Fuel Pressure Regulator (vacuum hose off, diaphragm leak, malfunctioning).
  • Leaking fuel injectors.
  • Fuel return line restricted.
  • Fuel rail pressure sensor (incorrect reading).
  • EVAP canister purge valve leak (when canister is full).

    Base engine.

  • Engine oil contamination.

    Air Measurement System.

  • MAF sensor (contaminated, damaged, or corroded connector).
Diagnostic Aids:  View Freeze Frame Data to determine the operating conditions when the DTC was set. Observe the LONGFT1 and LONGFT2 PID(s). Refer to ADAPTIVE FUEL DTCS DIAGNOSTIC TECHNIQUES for more information.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Dedicated NGV GO to PINPOINT TEST HA: NATURAL GAS FUEL CONTROL Step 10. GO to PINPOINT TEST HA: NATURAL GAS FUEL CONTROL Step 10. GO to PINPOINT TEST HA: NATURAL GAS FUEL CONTROL Step 10.
All others - - GO to PINPOINT TEST H: FUEL CONTROL Step 22.
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