Sök
C0221
System
Chassis (ABS / Stability)
Scanner som krävs
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Right Front Wheel Speed Sensor Signal Missing

Understand C0221, common causes, and the right TOPDON scanner to diagnose it.

No signal from the right front wheel speed sensor — ABS cannot monitor that wheel.

Vanliga symptom

  • ABS light
  • Traction control off
  • May set with C0033/C0040

Typiska orsaker

  • Open sensor circuit
  • Failed sensor
  • Broken tone ring
  • Hub bearing damage affecting sensor gap

Vilken scanner behöver du?

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

Använd live-data och freeze frame innan du byter delar. ABS-, SRS- och U-koder kräver oftast en fullsystems-scanner.

Diagnostiktips

  • Spara freeze frame när koden först sätts
  • Rensa koden först efter att orsaken är åtgärdad
  • Kontrollera relaterade väntande koder
  • Verifiera batterispänning över 12,4 V innan du misstänker sensorer

Rekommenderade TOPDON-scannrar

Vanliga frågor

What does C0221 mean?
C0221 indicates right front wheel speed sensor signal missing. No signal from the right front wheel speed sensor — ABS cannot monitor that wheel.
Can I diagnose C0221 with a basic code reader?
C0221 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 C0221?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with C0221?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.