What does code P1401 mean on Toyota vehicles?
The ECU detects that the sub-throttle position sensor signal is outside the expected range or does not correlate correctly with throttle demand and engine load.
OBD-II Code Toyota
P1401 — Toyota — Sub-Throttle Position Sensor Range/Performance Problem
The ECU detects that the sub-throttle position sensor signal is outside the expected range or does not correlate correctly with throttle demand and engine load.
Common symptoms
- Reduced engine power
- limp mode activation
- poor throttle response
Possible causes
- Sub-throttle sensor miscalibration
- sensor internal fault
- wiring issues
- throttle body contamination
Initial recommendation
Verify sub-throttle sensor calibration, inspect wiring and connector, and clean throttle body if necessary.
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 Toyota code P1401 with your vehicle's actual symptoms for more complete diagnostic guidance.
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