0414720310 Unit Injector – Product Page

Every VAG PD engine has a specific injector code assigned to it. This code is not arbitrary – it reflects the injector's flow characteristic, solenoid response, and pilot injection behaviour, all of which are matched to the engine's ECU calibration. If you replace an injector with one that has a different code, the ECU will struggle to adapt, and the engine may never run correctly. The 0414720310 is the correct injector for a specific set of VAG PD engine codes, ensuring that the ECU's base calibration matches the injector's characteristics. This means the engine starts cleanly, idles smoothly, and delivers the intended power without the ECU having to make large or persistent corrections.

The 0414720310 is a direct replacement for unit injectors in:

Volkswagen 1.9 TDI – BKC, BLS, BXE, BJB, BSW codes in Golf, Passat, Transporter, Caddy, and Polo models.

Audi 2.0 TDI – BKD, BMN, and BRE codes in A3, A4, and A6 models.

Seat and Škoda TDI – sharing the same PD engine architecture.

The injector uses a threaded mounting with a copper sealing washer at the nozzle end and an O‑ring on the upper body. The electrical connector is a 2‑pin VAG‑specific type.

Check the engine code – Before ordering, confirm your engine code is listed for the 0414720310.

Check the existing injector code – If replacing a single injector, note the code on the old injector. It should match the new injector.

ECU coding – Some VAG engines require the injector code to be entered into the ECU using diagnostic software. This tells the ECU which injector characteristic to use.

Adaptation reset – After installation, perform a fuel system adaptation reset. This clears the old trim values.

Torque sequence – Tighten the injector hold‑down clamp to 20 Nm, then loosen and retighten to 7 Nm, then turn 1/4 turn.

Priming – Pre‑fill the injector through the return port before installation.

The 0414720310 is compatible with EN 590 diesel and B7/B10 blends. Fuel quality affects the calibration through viscosity and density:

Viscosity – changes the flow rate through the nozzle, affecting the injection quantity. The ECU compensates for viscosity within a range.

Density – affects the mass of fuel delivered. The ECU uses a fuel density parameter to correct this.

If the fuel quality changes significantly, the ECU will adapt, provided the injector code is correct.

Under normal conditions, the 0414720310 provides 200,000–250,000 km of service. The calibration drifts as the injector wears:

Plunger wear – increases leakage, reducing fuel delivery.

Nozzle erosion – increases flow, increasing fuel delivery.

Solenoid wear – changes the opening and closing delay.

The first sign of calibration drift is often a change in fuel trim – the ECU applies larger corrections than before. When trim exceeds +5%, the injector is approaching the end of its service life.

Q1: Can I use the 0414720310 if my engine has a different code?
No. The 0414720310 is calibrated for specific engine codes. If your engine uses a different code, the fuel delivery will be incorrect. The ECU may be able to adapt, but the performance will not be optimal. Check your engine code before ordering.

Q2: How do I find my engine code?
The engine code is usually on a sticker in the spare wheel well, in the service booklet, or on the engine block. It is a three‑letter code (e.g., BKC, BKD, BLS).

Q3: Do I need to enter the injector code into the ECU?
Some VAG engines require the injector code to be entered using diagnostic software. If your vehicle requires this, the code is printed on the injector body. The 0414720310 has the code pre‑printed.

Q4: The engine runs rough after installation – did I get the wrong injector?
If the engine runs rough, check the injector code and the engine code. They must match. Also, check the ECU coding – the injector code may need to be entered into the ECU. Finally, perform an adaptation reset.

Q5: Can I code the ECU to accept a different injector?
Yes, but this requires specialised tuning software and knowledge. It is not recommended for standard engines – the correct injector is the safer and easier solution. Use the 0414720310 if it matches your engine code.

Q6: Does the 0414720310 have pilot injection?
Yes. The pilot injection is part of the injector's hydraulic design. It is not electronically controlled – it is a fixed pilot quantity set at the factory. This pilot injection reduces combustion noise and improves cold starting.

 

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