U257A Pontiac Aztec DTC Code

Pontiac Aztec Engine Specifications:

Engine Type :	Multi-Cylinder Engine
Cylinder Type :	Opposed Cylinder Engine
Engine Air Intake Process :	Supercharged Engine

Your Pontiac Aztec engine control system detects a problem, the computer stores the diagnostic trouble code U257A in its memory. To figure out what is wrong with your vehicle you must first extract the U257A DTC For Pontiac Aztec.

To solve U257A Pontiac Aztec problem, you'll have to remove the muffler, crankcase and other components blocking the valve chamber. Then, remove the cylinder head bolts (label for easy re-installation) Adjust the jaws of the valve spring compressor until they touch the top and bottom of the valve chamber Push the tool in to compress the spring and tighten the jaws Remove the retainers and lift out the valves , compressors and springs

U257A Pontiac Aztec DTC Meaning

U	Network Code - Problem is climate control system, lighting, airbags, etc.
2	MFG - Manufacturer Specific
5	Auxiliary Emission Controls
7	Exhaust Gas Recirculation System Valve 1
A	TFP Valve Position Switch-Drive Without Drive Ratio

When you turn on the ignition, the Service Engine Soon or Check Engine U257A Pontiac Aztec light should flash briefly, indicating that the OBD system is ready to scan your vehicle for any malfunctions. After this brief flash, the light should stay off while you drive as long as no problems are detected. If U257A DTC For Pontiac Aztec so, you'll be glad to know that your vehicle is equipped with an early warning system that could save you time, money, and fuel in addition to helping protect the U257A!