2003 Chevy Malibu dtc 172 code

2003 CHEVROLET MALIBU
60,000 MILES • 6 CYL • 2WD • AUTOMATIC
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160DB1999MUSTANG
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ENGINE HAD A 171 TO LEAN CODE USED FUEL INJ. CLEANER NOW HAS A 172 RICH CODE SHOULD I TRY FUEL INJ. CLEAN OR WHATELSE?
Mar 30, 2010 at 6:37 PM
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LEGITIMATE007
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if you have a rich code now after you put injector cleaner in, I would check the fuel pressure regulator, also check the engine coolant temp sensor.
Mar 30, 2010 at 9:41 PM
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LEGITIMATE007
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https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm
Mar 30, 2010 at 9:42 PM