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 rich calibrated limit. Refer to powertrain control software, FUEL TRIM for more information.
Possible Causes:	Fuel System: Damaged or leaking fuel pulse damper Leaking fuel injectors Fuel return line restricted Fuel rail pressure sensor bias EVAP canister purge valve is leaking when the canister is full Base engine. Engine oil contamination Air Measurement System: Damaged or contaminated mass air flow (MAF) sensor
Diagnostic Aids:	View freeze frame data to determine the operating conditions when the DTC was set. Observe the LONGFT1 and LONGFT2 PIDs. Refer to ADAPTIVE FUEL DTC DIAGNOSTIC TECHNIQUES for more information.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	-	-	GO to Pinpoint Test H .