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    P229F
    P20EE
    P2200

    P229F P20EE P2200 Audi 3.0 TDI – NOx Sensor Bank 1 Sensor 2 Circuit & SCR Efficiency

    Diagnostic Priority: High
    Complexity Level: Advanced

    Diagnostic guide for P229F, P20EE, and P2200 on Audi 3.0 TDI V6. Downstream NOx sensor G687 circuit fault, upstream G295, and SCR catalyst efficiency loss.

    Vehicle

    AUDI

    Codes

    3 units

    Analysis Type

    Technical Expert

    Status

    Analyzed

    Technical Analysis

    REF: #9F6301

    The combination of P229F, P20EE, and P2200 indicates NOx sensor element degradation (upstream G295 or downstream G687) on Audi 3.0 TDI V6 engines, resulting in SCR system efficiency fault codes.

    Expected Symptoms

    Glow plug light flashing and DPF icon illuminated on instrument cluster on AUDI (DTCs: P229F, P20EE, P2200)
    Engine enters limp home mode restricting engine output above 2,200 RPM
    Acrid exhaust odor and elevated fuel consumption due to aborted DPF regenerations

    System Impact

    Drivetrain
    Engine Control
    Emission Control

    Potential Fault Sources

    01Defective differential pressure sensor G450 or split silicone sample lines (affecting AUDI subsystem for P229F, P20EE, P2200)
    02Severe soot loading in DPF caused by short-trip driving and fouled injectors
    03Sticking EGR cooler changeover flap or faulty exhaust gas temp sensor G235 (logged fault: P229F)

    Workflow / Methodology

    01

    Verify supply voltage and sensor telemetry for P229F, P20EE, P2200 on AUDI with multimeter at key ON.

    02

    Check DPF differential pressure with key ON: must read precisely 0 hPa (0.48–0.52 V).

    03

    Query calculated soot mass and oil ash volume in ECM live data blocks.

    04

    Execute service regeneration cycle under load following sensor replacement.

    Live Data & Mätvärdestoleranser (Är/Bör-värden)

    Fabriksgodkända referensvärden vid diagnos och live-avläsning

    Mätvärdesblock
    Parameter / SignalTestvillkorBör-värde (Normalt)Avvikelse / Varning
    AdBlue MatartryckPump aktiv under drift4.5 – 6.0 bar< 4.0 bar (Tryckfall/Pumpfel)
    NOx-sensor uppströms (G295)Normal landsvägslast150 – 600 ppmFastfruset 0 ppm el >1200 ppm
    NOx-sensor nedströms (G687)Varm SCR-katalysator (>220°C)< 50 ppm> 120 ppm (Otillräcklig rening)

    Assessment & Action Proposal

    Technical Recommendation

    Install a new genuine NOx sensor assembly with integrated control module, reset SCR adaptation values in the ECU, and clear DTCs.

    Need a deeper analysis? Use our advanced fault code analyzer to find likely connections and in-depth guidance.

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    Vanliga frågor om dessa felkoder

    Vad är den primära orsaken till felkoderna?

    The combination of P229F, P20EE, and P2200 indicates NOx sensor element degradation (upstream G295 or downstream G687) on Audi 3.0 TDI V6 engines, resulting in SCR system efficiency fault codes.

    Kan man köra vidare med tänd motorlampa / varningslampa?

    Körning med aktiva felkoder kan leda till strypt motoreffekt (nödläge / Limp Home), blockerad partikelfilterregenerering eller följdskador på mekaniska komponenter. Felsökning bör genomföras omgående.

    Hur åtgärdas kombinationen på säkrast sätt?

    Install a new genuine NOx sensor assembly with integrated control module, reset SCR adaptation values in the ECU, and clear DTCs.

    Related Codes

    P229F
    P20EE
    P2200

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