P2251Exhaust leak, Oxygen sensor failure, Powertrain Control Module (PCM) failure, Wiring issue
⚙️ Powertrain (Motor y Transmisión)🏭 Specific to Audi
The negative current control line (Vs−) of the wide-band lambda sensor on bank 1 sensor 1 is open or out of range. Used as the virtual ground reference for the Nernst cell.
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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
Motor · Powertrain
La falla pertenece al grupo motopropulsor (motor y gestión electrónica).
Espacio para vendedores de repuestos
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Symptoms You Will Notice
What you may observe when this code appears
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Possible Causes
The components or conditions that trigger this code
- 1Vs− line open
- 2Wide-band sensor failed
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Estimated Cost
Approximate range in USD (varies by region and shop)
$100—$800
Varies by diagnosis
* Diagnosis only: $50–$150
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Quick Info
CodeP2251
CategoryMotor (P)
ManufacturerAudi
SeverityModerada
Symptoms4
Causes2
Solution steps0
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