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P0121 — TPS Circuit Range/Performance

The TPS values don't match expected patterns. The signal may be erratic.

Severity: HighRepair: $50-$400Difficulty: Medium

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Common symptoms of P0121

Common causes of P0121

Repair cost & difficulty

Typical cost to fix P0121: $50-$400 · Difficulty: Medium

Pro tip: A worn TPS shows erratic readings at a specific throttle opening — like a dead spot on a volume knob.

Vehicles commonly affected

All makes

Related trouble codes

P0120P0122P0123

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ScanFixAI is a diagnostic aid, not a substitute for professional repair. Cost estimates are typical ranges and vary by vehicle and region.