P2BA8Faulty NOx Sensors, NOx Sensors harness is open or shorted, NOx Sensors circuit poor electrical connection, Faulty Diesel Particulate Filter (DPF)
⚙️ Powertrain (Motor y Transmisión)🏭 Specific to Audi
NOx emissions are above the legal threshold and the ECU isolates the cause to interruption of reductant dosing. The injection valve, pump, or supply line is impaired.
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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).
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Symptoms You Will Notice
What you may observe when this code appears
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Possible Causes
The components or conditions that trigger this code
- 1Reductant injection valve clogged
- 2Reductant pump output insufficient
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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
CodeP2BA8
CategoryMotor (P)
ManufacturerAudi
SeverityModerada
Symptoms4
Causes2
Solution steps0
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