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Code P0121

Tiny
ZUSHIMARU
  • MEMBER
  • 2007 SATURN VUE HYBRID
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 150,563 MILES
Recently I checked my “check engine light” with a OBDII reader and I got P0121. “Throttle position sensor performance”. I just went to my local repair shop to ask them how much they thought it would cost to repair it. They told me that they could not find a replacement part for the throttle position sensor, and that they would have to run a diagnostic which starts at $99.00. Is this true? What could be wrong? Any idea as to how much in total this could possibly cost me?
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Monday, January 8th, 2018 AT 1:46 PM

1 Reply

Tiny
HARRY P
  • MECHANIC
  • 2,293 POSTS
Okay, that code actually indicates that air flow is more than the PCM expects it should be, based on the reported throttle position. It could be a bad sensor, or it could be an air leak of some sort. I am attaching ALLData's information on the code in the images below. I get that you may not be able to run all of the tests, but do what you can. I am also including a link to our how-to guide on finding and fixing vacuum leaks: https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Hopefully you will be able to find and fix your problem using it. Let us know what you find.
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Monday, January 8th, 2018 AT 8:47 PM

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