06F127025K
BOSCH 06F127025K High Pressure Fuel Pump VW Golf GTI Mk5 Jetta Passat Audi A4 B7 TT 2.0 TFSI EA113 0261520038
06F127025M, 06F127025J, 06F127025H, 06F127025F, 06F127025B, 261520038, 0261520044, HPP0004, 0261520038Integrated High-Speed Digital Flow Control Solenoid (N276)-120 barVehicle & Engine Fitment
| Vehicle | Engine | Years |
|---|---|---|
| Volkswagen Golf GTI Mk5 / Jetta GLI | Volkswagen / Audi EA113 2.0L TFSI (BPY / AXX / BWA / CDL) | 2005-2008 |
| Audi A4 B7 / A3 8P | Volkswagen / Audi EA113 2.0L TFSI (BPY / AXX / BWA / CDL) | 2005-2008 |
| Audi TT 8J | Volkswagen / Audi EA113 2.0L TFSI (BPY / AXX / BWA / CDL) | 2007-2014 |
Technical Specifications
| Specification | Value |
|---|---|
| System Type | VAG EA113 Bosch HDP 120-bar High-Pressure Direct Fuel Injection |
| Operating PressureCore Spec | |
| Pump Mechanism | Intake Camshaft Driven Single-Piston Plunger Pump |
| Mounting Flange Bolt Torque | 10 N·m (89 in-lb) M6 triple-square / Torx bolts |
| High-Pressure Line Nut Torque | 27 N·m (20 lb-ft) rigid steel delivery pipe flare nut |
| Low-Pressure Union Torque | 15 N·m (11 lb-ft) threaded brass inlet fitting |
| Cam Follower Interface | DLC Flat Tappet Bucket (requires mandatory inspection/replacement) |
| Manufacturer | Bosch (Tier-1 OEM for Volkswagen AG) |
| Bosch Production Number | 0261520038 / 0261520044 |
Matched High-Pressure Fuel Pump (Fuel Circuit Assembly)
Operates on the same high-pressure rail circuit. When troubleshooting low rail pressure (DTC P0087), verify pump volumetric delivery before replacing injectors.
Installation Tips
- Mandatory cam follower inspection: The flat bucket tappet wears through its black DLC coating; a perforated follower will grind the camshaft lobe flat, requiring camshaft replacement.
- Always replace the internal Viton sealing O-ring: Reusing the square-cut or round flange O-ring will result in oil weeping down the cylinder head timing chain housing.
- Counter-hold pump outlet fitting: Failing to support the hex adapter on the HPFP body when torquing the flare nut will crack the internal threaded aluminum boss.
- Prime before starting: Turn ignition key ON for 5 seconds three times without cranking to prime the low-pressure circuit and bleed air from the pump chamber.
Diagnostic Trouble Codes & Fault Protocols
Common diagnostic trouble codes (DTCs) triggered when this common rail injector experiences wear, circuit faults, or calibration drift:
Fuel Rail / System Pressure Too Low
Excessive internal backleak from worn control valve seats drops common rail pressure below target under engine load.
Injector Circuit Malfunction / Open Circuit
Solenoid coil resistance drift (0.2-0.5 Ω) or piezo stack degradation triggers driver stage shutdown on affected cylinders.
Cylinder Misfire & Balancing Deviation
Carbon-clogged nozzle spray holes or missing IMA calibration causes uneven cylinder contribution. Recode ECM and verify washer seating.
Fuel Rail / System Pressure Too High
Spill line backpressure or stuck metering valve prevents rail depressurization, creating overpressure risks under load.
Technical Diagnostic & Service Protocols
Authoritative field procedures, diagnostic testing thresholds, and service SOPs for this assembly.