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Old 04-26-2009, 01:29 AM   #2
OldNuc
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Join Date: Apr 2008
Location: Far Southwestern Iowa
Posts: 66,694
 

1998 SC2
Default Re: DTC P0131 HO2S Circuit Low Voltage Bank 1 Sensor 1

Low fuel pressure
Malfunctioning sensor
External water on sensor
Sensor wire shorted to ground

Check fuel pressure is within specs. If this code sets when you are running wide open throttle then fuel pressure low will do it. If the code sets while driving at something under 3400 RPM then its probably a bad sensor. Replace with a direct fit replacement and not a Bosch Universal. Denso or NGK work well.
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