2003 Hyundai Accent P0121 OBD2 Diagnostic Issue - How to Fix?

Model: 2003 Hyundai Accent Fault Code: P0121 Posted: 2018-08-09 07:31

I'm currently experiencing a Check Engine Light with fault code P0121 on my 2003 Hyundai Accent. I've already tried several troubleshooting steps, including replacing three TPS (Throttle Position Sensor) units and the entire throttle body assembly along with the IAC (Idle Air Control) and TPS sensors. After each replacement, the issue persists. I've also tested all three TPS sensors individually, and they are functioning properly according to my diagnostics. Despite these efforts, the P0121 code continues to appear in the OBD2 system. Could this be related to a wiring harness issue, a faulty ECU signal, or another underlying component? Any insights or solutions for this specific 2003 Hyundai Accent P0121 problem would be greatly appreciated. Help needed!