Does changing the O2 sensors make a d...

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Author Message   jeffreywklemp (Discocruiser) New Member Username: Discocruiser Post Number: 3 Registered: 05-2003 Posted on Wednesday, May 07, 2003 - 09:00 pm:    My yellow light keeps comming on, it's actually come on for the last three years and the dealer always just turned it off; untill now. It keeps giving error for the pre cat sensors. Should I change them and if so will I see any change in gas mileage or performance. Thanks   Paul T. Schram (Paulschram) Senior Member Username: Paulschram Post Number: 1420 Registered: 02-2002 Posted on Thursday, May 08, 2003 - 12:21 pm:    If the lights are on due to the sensors, you may well see an improvement in fuel economy.   gp (Garrett) Senior Member Username: Garrett Post Number: 2077 Registered: 10-2001 Posted on Thursday, May 08, 2003 - 12:32 pm:    how many mile you have on your truck?   jeffreywklemp (Discocruiser) New Member Username: Discocruiser Post Number: 4 Registered: 05-2003 Posted on Thursday, May 08, 2003 - 08:14 pm:    I have 114,000. They tell me at the dealer that the sensors are registering on the computer as picking up to much CO?....which I guess could mean spent sensors.