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2003 Chevrolet Impala code reading PO121

Tiny
HTRDJM
  • MEMBER
  • 2003 CHEVROLET IMPALA
  • 3.8L
  • V6
  • FWD
  • AUTOMATIC
  • 193,000 MILES
I have been getting a code reading PO121. So I changed out the throttle position sensor and it worked for a day and now getting the same reading again. Not sure where to look next.I thinking something else is causing the tps to malfunction but not sure what it could be.
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Friday, August 8th, 2014 AT 8:44 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Clean throttle late on both sides an diac hole with choke cleaner. Then look for a vacuum leak like ahose off or cracked/broken. Check map asensor for a bad seal and also check for a blocked sensor.
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Friday, August 8th, 2014 AT 9:45 AM

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