TW> That is called the limp home mode. i had my Chev S10 have that happen   
   TW> once.   
   TW> It is a deliberate action because of the SMOG laws.   
   TW> My Toyota Tacoma has Two oxygen sensors. One before the Cat converter to   
   TW> set the Fuel Air ratio and another one after the Cat converter to tweek   
   TW> the Emissions.   
   TW> I just had to have them both replaced and they are NOT cheep.   
   TW> The Air/Fuel sensor war $250 and the Reat sensor was $124   
      
   Yes, limp mode is when the computer is not reading or getting any data from a   
   particular sensor.  Like when one of the wires that went to my transmission   
   wore though and broke - causing the car to be stuck in 3rd gear.   
      
   This particular case was odd, given the O2 sensor was still sending a signal,   
   but it was constant high voltage (causing the computer to think it is running   
   way too rich).     
      
   Then the truck wasn't getting enough gas and was sputtering.  It would have   
   been better to just disconnect the O2 sensor completely.   
      
   - Mark   
      
   --- WWIVToss v.1.51    
    * Origin:  http://www.weather-station.org * Bel Air, MD -USA (1:261/1304.0)