Audi 3-Pin 2.5mm High-Pressure Fuel Pump Waterproof Connector – OEM 4D0971993A / 4D0971993
Direct OEM-specification replacement for the 3-pin waterproof wire harness connector used on high-pressure fuel pumps (HPFP) across Audi platforms. Cross-references Audi OEM part numbers 4D0971993A and 4D0971993 (also written as 4D0 971 993A). Uses the 2.5mm contact series in female housing with waterproof sealing — designed for direct injection high-pressure fuel pump applications on Audi’s V6, V8, and W12 engine platforms.
A failed connector causes the HPFP to lose its control signal, resulting in P0087 (low fuel pressure) and P0191 fault codes, hard starting, rough running, and potential no-start conditions. On Audi V8 and W12 engines, the HPFP connector is frequently damaged during engine bay work due to its location beneath the intake manifold.
| OEM Number | Application |
|---|---|
| 4D0971993A | Audi 3-pin HPFP connector (primary) |
| 4D0971993 | Audi 3-pin HPFP connector (superseded) |
| Pin | Function | Failure Symptom if Open |
|---|---|---|
| 1 | HPFP solenoid power supply (12V) | Pump inoperative, P0087 low fuel pressure |
| 2 | HPFP solenoid ground | Pump inoperative |
| 3 | ECM control signal (PWM) | Fuel pressure not regulated, P0191 |
| Attribute | Detail |
|---|---|
| Pin Count | 3-Pin |
| Contact Series | 2.5mm pitch |
| Gender | Female |
| Sealing | Waterproof |
| OEM Part Numbers | 4D0971993A / 4D0971993 |
| Applications | High-pressure fuel pump (HPFP), direct injection fuel system |
| Compatible Models | Audi A6 C5 4.2 V8; Audi A8 D2/D3 4.2 V8 / 6.0 W12; Audi S6 / S8 / RS6 (C5) |
| Terminal Included | Yes |
Q: My Audi A8 has a P0087 low fuel pressure fault — could it be the HPFP connector?
A: Yes. Inspect the connector before replacing the high-pressure fuel pump, which is a significantly more expensive repair.
Q: Are terminals included?
A: Yes, terminals are included with all variants.
Be the first to know about new collections and special offers.
3 Pin Connectors
