P0121Aston-martin VantageYears: 1996 - 2026
Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance
Reviewed by ASE Certified Technician
What does this mean?
Code P0121 means the TPS 'A' signal is outside the expected voltage range for the current engine conditions.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Aston-martin Vantage models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.
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Common Causes
Faulty throttle position sensor (TPS)
Dirty or faulty throttle body
Damaged, chafed, or broken wiring harness
Corroded or loose electrical connector
Symptoms to Watch For
- Check Engine Light is illuminated
- Poor acceleration or sluggish response
- Engine surging or fluctuating RPM
- Hesitation or stumble during acceleration
- Vehicle enters reduced power / limp mode