P0087 P0088 P0191 VW 2.0 TDI – Fuel Rail Pressure Sensor G247 Diagnostics
Diagnostic guide for P0087, P0088, and P0191 on Volkswagen 2.0 TDI. Fuel rail pressure sensor G247 signal drift, fuel pressure regulator, and stalling.
Vehicle
VOLKSWAGEN
Codes
3 units
Analysis Type
Technical Expert
Status
Analyzed
Technical Analysis
The combination of P0087, P0088, and P0191 indicates fuel rail pressure sensor G247 signal implausibility and erratic rail pressure regulation on VAG 2.0 TDI engines.
Expected Symptoms
System Impact
Potential Fault Sources
Workflow / Methodology
Verify supply voltage and sensor telemetry for P0087, P0088, P0191 on VOLKSWAGEN with multimeter at key ON.
Measure wastegate position feedback voltage at key ON: normal 3.5–3.9 V in closed position.
Smoke-test induction system and boost plumbing at 1.2 bar to pinpoint leaks.
Check crankcase depression with digital manometer at warm idle (-100 to -150 mbar).
Live Data & Mätvärdestoleranser (Är/Bör-värden)
Fabriksgodkända referensvärden vid diagnos och live-avläsning
| Parameter / Signal | Testvillkor | Bör-värde (Normalt) | Avvikelse / Varning |
|---|---|---|---|
| Railtryck Givarsignal (G247) | Tändning på (Motor av) | 0.50 V (0 – 5 bar) | > 0.65 V (Givardrift/Spånbeläggning) |
| Railtryck Är-värde | Tomgång varm motor | 250 – 320 bar | Avvikelse > ±15 bar mot Bör-värde |
| Railtrycksreglerventil N276 | Tomgång | 16 – 22 % PWM | > 30 % PWM (Högtrycksläckage) |
Assessment & Action Proposal
Technical Recommendation
Install a new genuine fuel rail pressure sensor G247 with fresh sealing washer, clean harness connector, 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 P0087, P0088, and P0191 indicates fuel rail pressure sensor G247 signal implausibility and erratic rail pressure regulation on VAG 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 fuel rail pressure sensor G247 with fresh sealing washer, clean harness connector, and clear DTCs.