P0087 P0088 P229A Audi 2.0 TDI – Bosch CP4 Fuel Pump Failure & Metal Shavings
Diagnostic guide for P0087, P0088, and P229A on Audi TDI. Bosch CP4 high-pressure pump failure, metal glitter in fuel system, and regulator N276.
Vehicle
AUDI
Codes
3 units
Analysis Type
Technical Expert
Status
Analyzed
Technical Analysis
The combination of P0087, P0088, and P229A indicates catastrophic Bosch CP4 high-pressure fuel pump failure on VAG 2.0 TDI engines, spreading metal glitter throughout the fuel circuit.
Expected Symptoms
System Impact
Potential Fault Sources
Workflow / Methodology
Verify supply voltage and sensor telemetry for P0087, P0088, P229A on AUDI 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
Complete fuel system overhaul: install new CP4 pump, 4 new injectors, fuel rail, lift pump, fuel filter, and thoroughly flush all fuel lines and fuel tank. 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 P229A indicates catastrophic Bosch CP4 high-pressure fuel pump failure on VAG 2.0 TDI engines, spreading metal glitter throughout the fuel circuit.
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?
Complete fuel system overhaul: install new CP4 pump, 4 new injectors, fuel rail, lift pump, fuel filter, and thoroughly flush all fuel lines and fuel tank. Clear DTCs.