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P0721
Sistema
Powertrain (Transmission)
Scanner richiesto
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Output Speed Sensor Circuit Range/Performance

Understand P0721, common causes, and the right TOPDON scanner to diagnose it.

Output shaft speed sensor signal out of range.

Sintomi comuni

  • Speedometer erratic
  • Harsh shifts
  • ABS light may accompany

Cause tipiche

  • Failed output speed sensor
  • Wiring fault
  • Internal transmission issue

Di quale scanner hai bisogno?

Full-system scanner (engine, ABS, SRS, transmission, service resets)

Usa dati live e freeze frame prima di sostituire componenti. I codici ABS, SRS e U richiedono di solito uno scanner full-system.

Consigli diagnostici

  • Registra il freeze frame quando compare il codice
  • Cancella il codice solo dopo aver risolto la causa
  • Controlla codici pending correlati
  • Verifica che la batteria sia sopra 12,4 V prima di sospettare i sensori

Scanner TOPDON consigliati

Domande frequenti

What does P0721 mean?
P0721 indicates output speed sensor circuit range/performance. Output shaft speed sensor signal out of range.
Can I diagnose P0721 with a basic code reader?
P0721 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Which TOPDON scanner do I need for P0721?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with P0721?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.