What does code P1121 mean on Honda vehicles?
The ECU detects that the throttle position is lower than expected compared to pedal input and engine load.
OBD-II Code Honda
P1121 — Honda — Throttle Position Lower Than Expected
The ECU detects that the throttle position is lower than expected compared to pedal input and engine load.
Common symptoms
- Poor throttle response
- hesitation
Possible causes
- Faulty throttle position sensor (TPS)
- misadjustment
Initial recommendation
Diagnose TPS operation and verify throttle body calibration.
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 Honda code P1121 with your vehicle's actual symptoms for more complete diagnostic guidance.
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