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1999 PONTIAC GRAND PRIX
168,543 MILES • 6 CYL • FWD • AUTOMATIC
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KNEEPADSLH
  • MEMBER
  • 5 POSTS
car runs fine while driving etc ever now and then its stalls i use my scan tool and got code po 120 low out put on circuit a and o2 sensor code no signal from o2 sensor. what will cause po120 . and how can i fix it . help help thanks.
Mar 19, 2012 at 7:45 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,244 POSTS
Check the throttle position sensor
Mar 19, 2012 at 8:09 PM
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KNEEPADSLH
  • MEMBER
  • 5 POSTS
will it be best to replace it or most of the time when this code po120 the tsp is bad
Mar 19, 2012 at 8:46 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,244 POSTS
Usually it is bad
Mar 19, 2012 at 8:52 PM
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