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Home >> Pontiac >> 2001 >> Aztek Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 88 (Engine Controls Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0169: Fuel Composition Sensor >> Test Description
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Test Description

WARNING: This page is about a different car, the 2002 GMC Sonoma and 2002 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic procedures.

  1. 2

    If DTC P0179 is also set, this diagnostic procedure will not find the cause and may lead to fuel replacement when that may not be appropriate. The technician must follow the diagnostic procedures for DTC P0179.

  2. 3

    The frequency read on the scan tool should be stable. A lower reading that momentarily rises above 100 Hz may indicate that water droplets in the fuel are present.
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