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 where fuel pressure and heat resistance are critical.
The 3-pin high-pressure fuel pump connector is located in the engine bay, directly on the HPFP body. On direct injection engines, the HPFP operates at pressures of 50–200 bar and generates significant heat. The connector is exposed to fuel vapour, heat cycling, and vibration from the pump. A failed connector causes the HPFP to lose its control signal, resulting in low fuel pressure fault codes (P0087, P0191), hard starting, rough running, and potential no-start conditions. On Audi V8 and W12 engines, the HPFP connector is also 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| 4D0971993 | Audi 3-pin HPFP connector (superseded) |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 / A8 D2 / A8 D3 (4.2 V8, 6.0 W12); Audi S6 / S8 / RS6 |
| Terminal Included | Yes |
Q: My Audi A8 has a P0087 low fuel pressure fault — could it be the HPFP connector?
A: Yes. A corroded or open 3-pin HPFP connector is a common cause of P0087 on Audi V8 and W12 engines. 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.
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