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Home >> Lexus >> 2007 >> RX 400h AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 191 (Engine Control System (2UZ-FE)) >> SFI System >> DTC P0171 System Too Lean (Bank 1): DTC P0172 System Too Rich (Bank 1): DTC P0174 System Too Lean (Bank 2): DTC P0175 System Too Rich (Bank 2) >> Typical Malfunction Thresholds
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Typical Malfunction Thresholds

WARNING: This page is about a different car, the 2007 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

Fuel trim: 

TYPICAL MALFUNCTION THRESHOLDS CHART

Purge-cut Executing
Either of following conditions (a) or (b) is met -
(a) Average between short-term fuel trim and long-term fuel trim +35% or more (varies with ECT)
(b) Average between short-term fuel trim and long-term fuel trim -35% or less (varies with ECT)