What does code P1129 mean on Lexus vehicles?
The ECU detects a general malfunction in the Electronic Throttle Control System (ETCS), affecting throttle operation and engine response.
OBD-II Code Lexus
P1129 — Lexus — Electronic Throttle Control System Malfunction
The ECU detects a general malfunction in the Electronic Throttle Control System (ETCS), affecting throttle operation and engine response.
Common symptoms
- Check engine light
- erratic throttle response
- reduced power
Possible causes
- Faulty sensors
- throttle actuator failure
- ECM malfunction
Initial recommendation
Perform complete ETCS diagnosis including sensors, actuator and ECM checks.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine Lexus code P1129 with your vehicle's actual symptoms for more complete diagnostic guidance.
Go to the app View more brands