P0493Fan Overspeed
The cooling fan is rotating faster than the commanded speed. The control unit measures the fan tachometer feedback against the requested duty cycle and finds it well above the expected band - typically a stuck-open relay, a shorted PWM line driving the fan to full power, or a feedback line that misreports speed.
Can I keep driving? With caution
You can drive to the shop, but do not postpone the repair. The problem may worsen and damage other components.
Sistema Afectado
Sistema de Escape · Catalizador y sensores O₂
La falla se localiza en la línea de escape: catalizador, sondas lambda (O₂) o sistema EGR.
Espacio para vendedores de repuestos
Aún no hay un anunciante en este espacio.
Possible Causes
The components or conditions that trigger this code
- 1Fan relay welded closed - fan runs uncontrolled PWM line shorted to supply Tachometer feedback miscalibrated
How to Fix It — Step by Step
Recommended diagnostic and repair procedure
- 1Difficulty: medium. Estimated time: 0.6-1.8 hours. Estimated cost: €80-€
- 2DIY possible
Note: This information is for general reference. For precise diagnostics and safety repairs, always consult a certified mechanic.
Estimated Cost
Approximate range in USD (varies by region and shop)
Varies by diagnosis
* Diagnosis only: $50–$150
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