P0121 problem

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02-21-2018, 03:36 PM

boltfan1953

Thread Starter

Join Date: 10-31-2014

Location: san diego

Posts: 2

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?

02-21-2018, 05:55 PM

Oldblue

Administrator

Join Date: 10-13-2011

Location: Welland,Ont Canada

Posts: 36,458

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.

02-21-2018, 10:05 PM

donbrew

Technical Moderator

Join Date: 01-23-2009

Location: Fredericksburg, Virginia

Posts: 24,671

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?