04L130277AC — Frequently Asked Questions
Verified answers about the Bosch 04L130277AC 2.0 TDI Common Rail Injector (VW Golf/Passat, Audi A3, Seat Leon, Skoda Octavia EA288).
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.