P046C P0401 P0405 Audi 2.0 TDI EA288 – EGR Sensor A Circuit & Insufficient Flow
Diagnostic guide for P046C, P0401, and P0405 on Audi 2.0 TDI (EA288). Troubleshoot low-pressure EGR position sensor drift and cooler soot accumulation.
Vehicle
AUDI
Codes
3 units
Analysis Type
Technical Expert
Status
Analyzed
Technical Analysis
The combination of P046C, P0401, and P0405 indicates a low-pressure EGR valve position sensor circuit failure and insufficient flow through the EGR cooler on Audi 2.0 TDI engines.
Expected Symptoms
System Impact
Potential Fault Sources
Workflow / Methodology
Verify supply voltage and sensor telemetry for P046C, P0401, P0405 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 |
|---|---|---|---|
| EGR Ventilposition (Är) | Stängd (Motorbroms/Fullgas) | 0.0 % (1.00 V) | > 3.5 % (Sotkärvning i säte) |
| EGR Ventilposition (Är) | Aktiv dellast | 20 – 65 % | Hänger kvar / Trög reglering |
| Luftmassa (MAF G70) | EGR fullt öppen på tomgång | 200 – 260 mg/slag | > 380 mg/slag (Otillräckligt EGR-flöde) |
Assessment & Action Proposal
Technical Recommendation
Install a new genuine EGR cooler and valve assembly, perform EGR adaptation 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 P046C, P0401, and P0405 indicates a low-pressure EGR valve position sensor circuit failure and insufficient flow through the EGR cooler on Audi 2.0 TDI engines.
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 EGR cooler and valve assembly, perform EGR adaptation in the ECU, and clear DTCs.