AUDI

P229F

P20EE

P2200

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

Priorytet diagnostyczny: Wysoki

Stopień złożoności: Zaawansowany

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.

Pojazd

AUDI

Kody

3 sterowników

Typ analizy

Ekspert techniczny

Status

Przeanalizowano

Analiza techniczna

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.

Oczekiwane objawy

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

Wpływ na układ

Układ napędowy

Sterowanie silnikiem

Układ oczyszczania spalin

Potencjalne przyczyny usterki

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)

Procedura diagnostyczna

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

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

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

Execute service regeneration cycle under load following sensor replacement.

Live Data & Mätvärdestoleranser (Är/Bör-värden)

Fabriksgodkända referensvärden vid diagnos och live-avläsning

Mätvärdesblock

Parameter / Signal	Testvillkor	Bör-värde (Normalt)	Avvikelse / Varning
AdBlue Matartryck	Pump aktiv under drift	4.5 – 6.0 bar	< 4.0 bar (Tryckfall/Pumpfel)
NOx-sensor uppströms (G295)	Normal landsvägslast	150 – 600 ppm	Fastfruset 0 ppm el >1200 ppm
NOx-sensor nedströms (G687)	Varm SCR-katalysator (>220°C)	< 50 ppm	> 120 ppm (Otillräcklig rening)

Ocena i zalecenia naprawcze

Rekomendacja techniczna

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

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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.