hunterjim00
New Member
Need a little help.. New To the Forum. I have a 2007 Chevy Tahoe LTZ. The Service Engine Light keeps coming on. It turns off occasionally but always comes back on. The code reads ( P0121 ) " Throttle Position Sensor 1 Performance ". I have replaced the TPS Sensor twice. I just don't know where else to start. Any help would be appreciated.