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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 116 (Engine Controls - Self-Diagnostics - 4.0L) >> Diagnostic Tests >> DTC P0172 & P0175: Fuel Trim System Rich, Bank 1 & 2 >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

Fuel contamination, such as water or alcohol will affect fuel trim. A bad MAF sensor can cause a rich condition. See DTC P0101: MASS AIRFLOW SENSOR SYSTEM PERFORMANCE . Using scan tool, review failure records. If an intermittent condition is suspect, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.

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