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P0172 - System Too Rich (Bank 1)

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
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 toPOWERTRAIN CONTROL SOFTWARE Fuel Trim for more information.
Possible Causes:  Fuel System:
  • Fuel pressure regulator (leaking or damaged)
  • 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

Intake Air System:
  • Mass air flow (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 PID. Refer toADAPTIVE FUEL DIAGNOSTIC TROUBLE CODE (DTCS) DIAGNOSTIC TECHNIQUES for more information.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   - - refer to PINPOINT TEST H .
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