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Home >> Audi >> 2015 >> A4 Prestige >> Repair and Diagnosis >> External Pages >> Different car >> Section 379 (Engine Control System (Diagnostic Codes (P0010-P0172))) >> SFI System >> DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1) [08/2013 - ] >> Monitor Strategy

Monitor Strategy

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
Related DTCs P0171: Fuel trim lean
P0172: Fuel trim rich
Required Sensors/Components (Main) Fuel system
Required Sensors/Components (Related) Air fuel ratio sensor
Mass air flow meter sub-assembly
Crankshaft position sensor
Frequency of Operation Continuous
Duration Within 10 seconds
MIL Operation 2 driving cycles
Sequence of Operation None
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