03L130277B Injector Genuine OEM Common Rail Diesel Fuel Injector for VW Audi Skoda SEAT 1.6 TDI

About this part

The 03L130277B injector is a brand new genuine OEM common rail diesel injector built by Continental, originally under the Siemens VDO name, for the 1.6 TDI engines used across the Volkswagen Group from 2009 onwards. It is a solenoid operated injector with a two pin electrical connector at the top, a threaded high pressure inlet, a steel clamping collar, a copper sealing washer at the nozzle seat and a slim nozzle that projects into the combustion chamber. The laser marking on the electrical plug reads 03L 130 277 B with the production index C001, and the corresponding Continental numbers for this unit are A2C59513554, A2C9626040080 and 5WS40539. This is the injector fitted to the CAYA, CAYB, CAYC and CLNA 1.6 TDI engines that produce 66 to 77 kW, roughly 90 to 105 PS, in the Golf VI, Polo, Passat, A1, A3, Ibiza, Octavia and Fabia. If one cylinder of a 1.6 TDI has started to misfire on a cold start, or the engine reports an injector correction value outside the allowed window, this is the part that normally gets replaced.

injector — genuine 03L130277B Continental / Siemens VDO 1.6 TDI common rail solenoid injector, brand new and sold individually, superseded by 03L130277S; one injector is supplied per unit ordered.

OE/OEM Part Number:

03L130277B, 03L130277S, 03L130277C, 03L130277, 03L 130 277 B, 03L 130 277 S, A2C59513554, A2C9626040080, A2C9626040082, 5WS40539, 562000110

Continental / Siemens VDO: A2C59513554, A2C9626040080, 5WS40539

What you receive

This listing is for one injector. The original packaging is marked Injector 03L130277B 1 PC, and the price shown is for a single injector. The photographs show four identical injectors laid out together so that the electrical connector, the high pressure inlet, the clamping collar, the copper washer and the nozzle tip can all be seen from different angles; they are a product display, not a four piece set. A 1.6 TDI four cylinder engine uses four of these injectors, so order a quantity of four if the whole bank is being replaced. The tiered pricing below applies to 1 pc, 5 pcs and 20 pcs respectively, which suits workshops that keep a spare injector on the shelf or replace a full set across several vehicles.

Each injector ships with a new copper sealing washer at the nozzle seat. The high pressure pipe and the clamping bolt are not included; VW specifies a new high pressure line whenever an injector is removed, because the sealing cone deforms on first tightening and a reused pipe will weep diesel under rail pressure.

What this injector does and why it fails

Metering under very high pressure. A common rail pump feeds diesel into a shared accumulator at up to roughly 1600 bar. The engine control unit energises the solenoid in each injector several times per combustion cycle to deliver a pilot injection, one or more main injections and often a late post injection that raises exhaust temperature for DPF regeneration. Opening and closing the needle in a few milliseconds at that pressure demands clearances measured in microns, which is why a worn nozzle or a sticking needle changes the spray pattern long before the injector stops working altogether.

How wear shows up. Carbon and fuel borne deposits build up around the nozzle holes and narrow them, so the delivered quantity drifts away from the value the ECU expects. The ECU compensates by trimming the injection duration and logging an injector correction or balancing value for that cylinder. As the margin runs out the engine develops a rough cold idle, a diesel knock at light load, hesitation on pull away, black smoke under acceleration, higher fuel consumption and more frequent DPF regenerations. A leaking seat lets diesel drain into the cylinder overnight and causes extended cranking, while a corroded connector or a broken solenoid winding produces an open circuit fault on that cylinder. Diagnostic codes commonly seen include cylinder misfire, injector circuit faults and rail pressure regulation errors, but a scan alone cannot separate a tired injector from a leaking pipe or a weak rail pressure regulator, so return flow and balancing values should be checked before ordering.

Part number confusion: this is the 1.6 TDI common rail injector

Three different systems share similar looking numbers. Please read this before ordering, because the 03L 130 277 number family is frequently listed incorrectly. This 03L130277B is a Continental / Siemens VDO solenoid common rail injector for the 1.6 TDI CAYA, CAYB, CAYC and CLNA engines. It is not the Bosch common rail injector quoted as 03L 130 277 without a suffix, 0445116029, 0445116030 or 0986435360 for the 2.0 TDI CFFB, CBAB and CBBB engines, and it is not the Bosch unit injector or pump nozzle assembly quoted as 038130073AG or 0414720215 for the older 1.9 TDI PD engines. Those parts have a different body, a different connector, a different injection system and a different calibration. Fitment is by the number stamped on your original injector and by the engine code, not by the model name alone.

Supersession and cross references. VW later issued the same injector as 03L130277S, and the Continental service numbers A2C59513554 and A2C9626040080 are widely used by diesel specialists for this family. The stamping 5WS40539 belongs to the Siemens VDO production series. Some catalogues also list 03L130277C, A2C9626040082 and 562000110 alongside it. All of these refer to the same 1.6 TDI common rail application. If your original injector carries one of those numbers, this is the correct replacement road. Units from a breaker may have unknown hours and an unknown correction code; a brand new injector avoids both problems.

Matching a set. Where only one cylinder has failed, a new injector can be fitted on its own provided the remaining three balance values are healthy. If the whole set is worn, replacing all four together and coding all four correction values gives a smoother idle and avoids the ECU fighting an uneven bank. Mixing a new injector with three heavily worn ones often leaves a residual roughness that customers mistake for a faulty new part.

Injector coding and installation notes

Coding is mandatory. Every Continental injector carries a calibration or correction code, often called the IMA or ISA code, printed on the upper body near the connector. After mechanical fitting, the code for that cylinder must be written into the engine control unit with ODIS, VCDS or an equivalent VW Group capable tool. The ECU uses it to compensate for the tiny manufacturing differences in each injector’s delivered quantity. Skipping this step leaves the engine running on a default value and can cause rough idle, uneven cylinder contribution, smoke and a balancing fault that will not clear. Coding and diagnostic labour are the responsibility of the fitting workshop and are not covered by the parts warranty.

Mechanical fitting. Work on a cold engine with the ignition off and the high pressure rail relieved. Cap the open fuel lines immediately so no dirt reaches the rail, because contamination is the single biggest cause of a new injector failing early. Fit a fresh copper sealing washer, seat the injector squarely in the head, tighten the clamping bracket to the VW specified torque, fit a new high pressure pipe and tighten its unions to specification without overloading the inlet. Reconnect the two pin plug until it clicks, prime the fuel system according to the workshop manual, check for leaks at cranking pressure before starting, then enter the correction code and clear faults. A short road test with the balancing values on the scan tool confirms the repair.

Physical specification. Solenoid operated common rail injector for 1.6 TDI 1598 cc diesel engines, approximately 0.6 kg per injector, two pin electrical connector, threaded high pressure inlet, steel clamping collar and copper nozzle seat washer. Brand new, factory tested for flow and spray pattern, supplied in protective packaging. Confirm the part number and engine code on the original unit or send us the VIN before ordering.

Fitment

Fitment depends on the engine code and on the number stamped on the original injector, not on the model name by itself. Use this table as a guide and check your VIN or the old part before ordering:

Shipping and packing

Orders leave within one to two working days of cleared payment. Each injector is capped at the high pressure inlet and the nozzle, wrapped to protect the connector and the laser marked body, and packed in a foam lined box so the calibration code stays readable on arrival. Tracking is emailed when the parcel is handed to the carrier. Customs charges, where they apply, are the buyer’s responsibility.

Condition & warranty

Brand new genuine quality 03L130277B injector, twelve months warranty against manufacturing defects covering the unit as supplied. The warranty does not cover damage from contaminated fuel, a reused high pressure pipe or sealing washer, incorrect torque, dirt introduced during fitting, missing injector coding, or diagnostic and coding labour. If a part arrives faulty, send us photographs and the fault scan before returning anything.

Wholesale

Tiered pricing for 1 pc, 5 pcs and 20 pcs is shown below. Diesel specialists, taxi fleets and independent VAG workshops usually order these injectors in sets of four, because a 1.6 TDI four cylinder engine uses one injector per cylinder and a worn bank is best replaced and coded together. Ask for a combined quote if you also need high pressure pipes, copper sealing washers, glow plugs or a rail pressure sensor for the same job; we price mixed orders together and can hold stock for repeat workshop orders.