Code help on my Bravada

spddmn1 · 02-12-2007, 06:49 PM

My wife's 01 Bravada is throwing 2 codes. P0171 & P0174. They are fuel trim system leak bank 1 & bank 2. Any ideas what it is. Really don't have the $$$$ to take the car in, would like to do it myself if possible.

Rammer500 · 02-12-2007, 08:04 PM

Visually and physically check the following items:

The exhaust system for leaks
The fuel filter for restriction
The air induction system after the MAF sensor for vacuum leaks
The vacuum hoses for splits, kinks, and proper connections
The throttle body, intake manifold, and EGR valve for vacuum leaks
Idle air control (IAC); if a high or unsteady idle is being experienced.
The positive crankcase ventilation valve (PCV), spring and O-ring for proper installation
The AIR system for proper operation (if applicable). An AIR system that allows oxygen to enter the exhaust may present a lean condition.
The fuel for excessive water, alcohol, or other contaminates
VCM and sensor grounds are clean, tight and in the proper location.

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