3-Pin 2.8mm Bosch Engine & Diesel Injection Pump Connector – OEM 1928405528 | Grey
Direct OEM-specification replacement for the Bosch 3-pin 2.8mm grey connector used on diesel injection pumps, fuel rail pressure sensors, and engine management sensors. Cross-references Bosch part number 1928405528 (1 928 405 528). The grey housing colour is used by Bosch to distinguish this connector from the black 2.8mm variant, preventing mismating in multi-connector harness installations. Used across VW, BMW, Ford, and Opel diesel platforms. Available bare or with 15cm pre-wired leads.
Diesel injection pump connectors are mounted in one of the harshest environments in the engine bay — directly adjacent to the high-pressure fuel pump, which generates significant heat during operation. The combination of fuel vapour, heat cycling, and vibration accelerates terminal oxidation. A corroded injection pump connector causes the ECU to lose the fuel rail pressure signal, triggering limp mode and preventing the engine from building sufficient injection pressure for cold starts. This is one of the most common causes of diesel hard-start and no-start conditions that are misdiagnosed as a failed injection pump before the connector is inspected.
| Segment | Meaning |
|---|---|
| 1928 | Bosch connector component family |
| 405 | 2.8mm series, sealed (waterproof) |
| 528 | 3-pin grey variant |
| Pin | Function | Failure Symptom if Corroded |
|---|---|---|
| 1 | +5V reference voltage from ECU | P0193 — fuel rail pressure sensor circuit high, limp mode |
| 2 | Fuel rail pressure signal output to ECU (0–5V) | P0190 / P0191 — fuel rail pressure circuit malfunction / range |
| 3 | Signal ground / return | P0192 — fuel rail pressure sensor circuit low, hard start |
| Attribute | Detail |
|---|---|
| Pin Count | 3-Pin |
| OEM Part Number | 1928405528 / 1 928 405 528 (Bosch) |
| Terminal Pitch | 2.8mm |
| Housing Colour | Grey (mismating prevention) |
| Housing Material | High-temp nylon (PA66), waterproof sealed |
| Wire Option | Bare connector / 15cm pre-wired leads |
| Application | Diesel injection pump harness, fuel rail pressure sensor harness, engine management sensor |
| Compatible Brands | VW, BMW, Ford, Opel / Vauxhall |
| Code | Description |
|---|---|
| P0190 | Fuel rail pressure sensor — circuit malfunction |
| P0191 | Fuel rail pressure sensor — range/performance |
| P0192 | Fuel rail pressure sensor — circuit low |
| P0193 | Fuel rail pressure sensor — circuit high |
Q: My diesel is hard to start when cold and has P0192 — is it the connector?
A: P0192 (fuel rail pressure circuit low) on a diesel causes the ECU to assume insufficient fuel pressure and limit injection quantity, resulting in hard cold starts and white smoke. A corroded ground pin (Pin 3) in the 3-pin injection connector is a common cause. Inspect the connector before replacing the fuel rail pressure sensor or injection pump.
Q: Why is this connector grey instead of black?
A: Bosch uses grey housing on this 2.8mm connector to prevent mismating with the black 2.8mm variant in multi-connector harness installations. Both are functionally identical in terminal pitch and current rating, but the colour difference ensures the correct connector is installed in the correct location.
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
