04L130277AC — Technical Research
Bosch 04L130277AC (Bosch 0445110611/0445110612) CRI2.20 piezo common-rail injector for the VW Group 2.0 TDI EA288 (DFGC/DEUC/DBGC) across VW Golf VII/Passat B8/Tiguan, Audi A3/Q3, Seat Leon and Skoda Octavia/Superb. IMA/IQA correction coding required. Remanufactured, calibrated, 12-month warranty. Key symptoms: Rough idle / vibration; Hard starting; Loss of power / limp mode; Black smoke. Common failure modes: Internal wear / high back-leakage; Nozzle coking / poor spray pattern; Water-in-fuel corrosion.
Bosch 04L130277AC 2.0 TDI Common Rail Injector (VW Golf/Passat, Audi A3, Seat Leon, Skoda Octavia EA288)
Bosch 04L130277AC (Bosch 0445110611/0445110612) CRI2.20 piezo common-rail injector for the VW Group 2.0 TDI EA288 (DFGC/DEUC/DBGC) across VW Golf VII/Passat B8/Tiguan, Audi A3/Q3, Seat Leon and Skoda Octavia/Superb. IMA/IQA correction coding required. Remanufactured, calibrated, 12-month warranty. Key symptoms: Rough idle / vibration; Hard starting; Loss of power / limp mode; Black smoke. Common failure modes: Internal wear / high back-leakage; Nozzle coking / poor spray pattern; Water-in-fuel corrosion.
A leaking or out-of-calibration injector unbalances cylinder fuelling, felt as a shake at idle.
Excess back-leakage bleeds rail/line pressure during cranking, causing long or failed starts.
Out-of-range delivery or pressure deviation triggers a torque cut and limp home.
Poor atomisation or a dribbling nozzle over-fuels the cylinder.
Cylinder-specific injector, balance or fuel-metering fault codes are logged.
- InstallationCode the injector IMA/IQA correction value to the correct cylinder with VCDS/ODIS on fitment before road test.
- InstallationRenew the copper combustion washer and leak-off seals; torque the clamp/nut to manufacturer spec.
- MisdiagnosisRead live back-leakage and per-cylinder contribution data to confirm the weak cylinder before removal.
- TestingBench-test across delivery and back-leakage points and verify spray pattern before refit.
- WarningConfirm fitment by OE number and engine code before ordering; injector sub-variants are not always interchangeable.
What is injector 04L130277AC?+
04L130277AC is a Bosch common rail piezo injector (cri2.20) diesel injector for the VW Group 2.0 TDI EA288 (DFGC/DEUC/DBGC). It is supplied remanufactured, bench-tested and calibrated to OEM specification.
Which vehicles use 04L130277AC?+
It is fitted to the VW Group 2.0 TDI EA288 (DFGC/DEUC/DBGC) — including Volkswagen Golf (Mk7) 2.0 TDI (EA288, DFGC/DEUC); Volkswagen Passat (B8) 2.0 TDI (EA288, DFGC/DEUC); Volkswagen Tiguan (AD1) 2.0 TDI (EA288, DFGC/DBGC); Audi A3 (8V) 2.0 TDI (EA288). Confirm fitment by OE number and engine code.
What type of injector is 04L130277AC?+
It is a Bosch Common Rail Piezo Injector (CRI2.20). Always confirm the OEM markings on the injector body before fitting.
Does 04L130277AC need coding when fitted?+
Yes — the injector IMA/IQA correction value must be written to the correct cylinder with VCDS/ODIS on fitment.
What are the symptoms of a failing 04L130277AC?+
Common signs are rough idle and vibration, hard starting, power loss or limp mode, black smoke and an engine-management light.
What causes these injectors to fail?+
Most failures come from poor fuel filtration, contamination and water in the fuel leading to wear, high back-leakage and nozzle coking. Fix the cause before fitting replacements.
Is a remanufactured 04L130277AC as good as new?+
A properly remanufactured injector is stripped, fitted with new wear parts, reassembled and recalibrated on a common-rail test bench to OEM tolerances, then supplied with a warranty.
Should I replace one injector or the full set?+
Replace the confirmed faulty injector first. On high-mileage engines fitting a matched set reduces the chance of a repeat fault, but it is not mandatory if the others test within spec.
Do you bench-test the injector before dispatch?+
Yes. Every unit is tested for delivery, back-leakage and spray pattern on a calibrated common-rail tester before it leaves us.
Is delivery and warranty included?+
Yes — the price includes free UK delivery and a 12-month warranty.
Does 04L130277AC need IMA/IQA coding?+
Yes — write the injector IMA/IQA correction value to the correct cylinder with VCDS/ODIS on fitment, or the EA288 2.0 TDI may run rough and log balance faults.
Is this the 1.6 TDI or 2.0 TDI EA288 injector?+
04L130277AC is the 2.0 TDI EA288 injector (DFGC/DEUC/DBGC). It is not interchangeable with the 1.6 TDI EA288 injector — confirm the OE suffix and engine code before ordering.