P229F P20EE P2200 Audi 3.0 TDI – NOx Sensor Bank 1 Sensor 2 Circuit & SCR Efficiency
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
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
System Impact
Potential Fault Sources
Workflow / Methodology
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
| 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) |
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.
Start Fault Code AnalyzerVanliga 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.