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P0121 problem

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Old Feb 21, 2018 | 03:36 PM
  #1  
boltfan1953's Avatar
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Joined: 10-31-2014
Posts: 2
From: san diego
P0121 problem

We have been getting a p0121 code, so we cleaaned the TBS. Got worse, idle went up, so we replaced it and the pedal postion sensor. Same problem, idle at start is at 3-4000rpm,, goes down in drive but when you accelerate goes back up. Any suggestions?
Old Feb 21, 2018 | 05:55 PM
  #2  
Oldblue's Avatar
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Joined: 10-13-2011
Posts: 39,972
From: Welland,Ont Canada
Welcome to the site, P0121 has a relation to the harness rubbing .
As per
https://www.obd-codes.com/p0121

Check the wiring harness for chafing against the bracket under the EVAP valve.


Old Feb 21, 2018 | 10:05 PM
  #3  
donbrew's Avatar
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Joined: 01-23-2009
Posts: 26,480
From: Fredericksburg,VA
I'd guess at either a broken wire or a bad MAF.

Sounds like The #1 signal wire is not connected somewhere between the TB and the ECM.

Are there any more codes or things you didn't think were relevant?




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