0261500065
BOSCH 0261500065 Direct Fuel Injector Mercedes M276 3.0T V6
A2760700587, A2760700187, A2760700287, 0261500065, 0261500066-High-Dispersion Laser Multi-Hole Fan Pattern200 barProduct Overview
The Bosch 0261500065 (Mercedes-Benz OE A2760700587 / A2760700187) is the factory high-pressure direct fuel injector for Mercedes-Benz M276 3.0L BiTurbo V6 and 3.5L CGI BlueDIRECT engines. Operating at rail pressures up to 200 bar (2900 psi), this high-speed solenoid injector uses an advanced laser-drilled multi-hole nozzle tip to produce optimized fuel stratification across multiple injection events per combustion cycle. Fitted to prestige models including the C400, C43 AMG, E400, S450, and GLE43 AMG, it solves rough cold idling, sluggish throttle response, and diagnostic codes P0300 through P0306 caused by fuel nozzle deposits or solenoid wear.
COLD START MISFIRE & CYLINDER WASH WARNING: A leaking 0261500065 direct injector drips pressurized fuel into the combustion chamber overnight, causing rough idle, raw fuel exhaust odor, and flashing check engine misfires (P0300/P0301-P0306) on morning startup. Persistent fuel dripping washes away cylinder wall oil films (cylinder wash), leading to piston ring scuffing and catastrophic cylinder scoring on high-output M276 BiTurbo engines.
Vehicle & Engine Fitment
| Vehicle | Engine | Years |
|---|---|---|
| Mercedes-Benz C43 AMG W205 | Mercedes-Benz M276 (3.0L BiTurbo & 3.5L CGI BlueDIRECT V6) | 2016-2021 |
| Mercedes-Benz E400 / E450 W213 | Mercedes-Benz M276 (3.0L BiTurbo & 3.5L CGI BlueDIRECT V6) | 2016-2020 |
| Mercedes-Benz GLE43 AMG W166 | Mercedes-Benz M276 (3.0L BiTurbo & 3.5L CGI BlueDIRECT V6) | 2016-2019 |
Technical Specifications
| Specification | Value |
|---|---|
| Injector Generation | Bosch HDEV-5 Multi-Hole Solenoid Direct Injector |
| Operating Rail PressureCore Spec | |
| Injection Architecture | Mercedes-Benz BlueDIRECT Piezo/Solenoid Homogeneous Direct Injection |
| Nozzle Spray PatternCore Spec | |
| Coil Resistance | 1.5 to 2.0 Ohms at 20°C (Peak-and-Hold Driver) |
| Combustion Seal Type | Virgin Teflon (PTFE) Ring with Stainless Compensating Spring |
| Teflon Ring Service Part | Mercedes-Benz OE A0189971845 |
| Fuel Rail Retaining Torque | 9 N·m (E-Torx M6, criss-cross torque) |
| Tightening Torque | 28 N·m |
| Hold Down Torque | 9 N·m |
| Operating PressureCore Spec |
Installation Tips
Tools needed: E-Torx socket set (E8/E10) and 17mm line flare wrench, Mercedes-Benz Teflon seal sizing tool set (W276 589 00 33 00), Torque wrench calibrated for 9-28 N·m, Clean lint-free shop rags and eye protection, XENTRY diagnostic scanner for fuel rail pressure leak testing
- Disconnect vehicle battery negative cable and allow engine to cool completely.
- Wrap the fuel rail inlet line with clean rags and crack the 17mm flare nut slowly to vent residual 200-bar fuel rail pressure.
- Disconnect the electrical wiring harness plugs from all injectors on the cylinder bank.
- Loosen the E-Torx fuel rail mounting bolts evenly in half-turn increments to avoid cocking the rail.
- Using the factory puller tool, gently extract the fuel rail and injectors straight out of the cylinder head bores.
- Remove the injector retaining clips and extract the injector from the rail receptacle.
- Inspect the cylinder head injector bore; clean carbon deposits using a brass brush and vacuum; never scratch the sealing seat.
- Install a brand new Teflon combustion seal (A0189971845) using the cone expansion tool and compression sizing sleeve; wait 3 minutes for seal to shrink.
- Lightly lubricate the upper Viton O-ring with clean engine oil (KEEP TEFLON RING DRY).
- Seat the injector into the fuel rail receptacle and snap the retaining clip into position.
- Align the injectors squarely into cylinder head bores and press fuel rail into place by hand.
- Torque fuel rail mounting bolts evenly in a criss-cross pattern to 9 N·m, then torque fuel line flare nut to 28 N·m.
- Strict Teflon Seal Dry Assembly Rule: NEVER apply engine oil, grease, or solvent to the lower Teflon combustion seal ring. The Teflon seal must remain completely dry; lubrication prevents proper heat expansion and causes combustion blow-by.
- Three-Minute Teflon Dwell Time: After compressing the new Teflon ring with the sizing sleeve tool, leave the sleeve on the injector for at least 3 minutes. This allows the PTFE material to retain its compressed diameter for effortless bore insertion.
- Replace Retaining Spring Clips: Always replace the stainless-steel injector compensating spring clips (OE A2760720043) when servicing injectors. Fatigued clips allow micro-vibrations that crack the plastic injector body.
Frequently Asked Questions
What diagnostic trouble codes indicate a failing direct fuel injector on Mercedes M276 3.0T?
The most frequent codes are P0300 (Random Misfire) and cylinder-specific misfires P0301 through P0306, especially on cold starts. Chronic dripping also triggers P0172 or P0175 (System Too Rich) due to unmetered fuel pooling in the intake ports.
Can I reuse the Teflon combustion seal when removing an M276 injector?
No. The Teflon seal expands irreversibly under combustion chamber heat and pressure. Re-using an old Teflon seal guarantees combustion gas blow-by, which burns through the cylinder head injector bore and destroys the injector body.
Do Bosch 0261500065 injectors require coding into the Mercedes ME-SFI control unit?
Unlike diesel common rail injectors with individual IMA codes, Bosch HDEV-5 gasoline injectors on M276 engines are built to strict laser-matched tolerances. Individual injector coding is not required; the ECU adapts fuel trims automatically via wideband O2 sensors.
Say this to the shop: How can the technician isolate which M276 injector is leaking?
Ask the technician: 'Please connect XENTRY and run the Fuel Rail Pressure Residual Leak Test after shutting the engine down. If rail pressure bleeds down quickly, use a borescope through the spark plug holes to check which piston top is wet with pooled fuel.'
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.
Cross-Reference & Compatibility
Sister parts, same-platform variants, and known incompatibilities.
Technical Diagnostic & Service Protocols
Authoritative field procedures, diagnostic testing thresholds, and service SOPs for this assembly.