Bosch 03G130073G Diesel Injector

On the 2.0L TDI PD platform, a failing Bosch 03G130073G injector typically presents as: rough idle with single-cylinder knock; hard starting, especially cold; loss of power / limp mode; misfire entries on individual cylinders; increased tappet-style noise from the head.

When two or more of these appear together, suspect the injector before peripheral systems — a comparative leak-off test and live-data cylinder-balance review will isolate the failed unit without tear-down.

The documented failure modes on this platform are: unit injector (pumpe-düse) wear causing calibration drift and rough running; injector solenoid faults logging cylinder circuit codes; injector loom and connector wear under the rocker cover causing intermittent faults.

Internal wear cannot be repaired in situ — once delivery drifts outside calibration, remanufacture or replacement is the reliable fix.

This is a Pumpe-Düse (unit injector) system — there is no common rail; diagnosis differs from CR engines. Check the injector wiring loom under the rocker cover first — it is a known wear point on this platform. Unit injectors are cam-actuated: inspect the camshaft lobes when replacing injectors on high-mileage engines. Torque and alignment of the injector clamps is critical — follow the manufacturer procedure exactly.

Never condemn a common-rail injector on a fault code alone — codes identify the circuit or cylinder, while leak-off volumes and correction values identify the component.

Each remanufactured 03G130073G is fully stripped, ultrasonically cleaned and inspected; worn components are replaced with OE-grade parts. The rebuilt unit is then calibrated on a common-rail test bench against the manufacturer's specification sheet — delivery, back-leak and response are all verified before the injector is sealed and despatched with its calibration data on file.

Every unit carries a 12-month parts warranty and free UK delivery.

The 03G130073G trusted family covers 8 verified vehicle fitments across 4 makes: VW, Audi, Skoda and Seat. Every fitment listed on this page is registry-verified — no scraped or assumed applications.

03G130073G supersedes or cross-references 11 further OE numbers, including 03G130073GX, 0414720454, 0414720404, 0986441516, 0986441566, MN980235, DI427 and 87119. Always match the reference etched on your failed unit's body — cross-references within a family are verified equivalents, but etched numbers remain the source of truth.