Remanufactured common rail injector, cross-ref 5WS40539, A2C59513554, 03L130277B. Bench-tested before shipment.
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5WS40539 is supplied as a remanufactured replacement common rail injector. Cross-reference numbers: 5WS40539, A2C59513554, 03L130277B. An injector is a high-speed valve. It has to hold back rail pressure, then open and close within a fraction of a crankshaft degree — several times per cycle on pilot-injection engines. Anything that alters opening behaviour, whether it is carbon on the tip, a worn needle or a tired solenoid, changes how the cylinder burns its charge. Watch for hard hot starting, uneven idle, visible smoke, a misfire that clears when the engine is revved, and consumption creeping up without any change in operating conditions. Before replacing anything, distinguish injector faults from their look-alikes. Comparing return volume between cylinders and running a cut-out test on a diagnostic tool will show which cylinder is actually contributing — cheap checks that prevent replacing parts that were not faulty. Before fitting: clean the seat thoroughly, use new copper washers and seals, and torque the clamp to the engine manufacturer’s figure. Replace as a set where possible, and check whether the ECU needs the new units’ classification codes written in afterwards. Our rebuild standard: strip to components, clean, measure against wear limits, replace what is worn, machine back to specification where required, then calibrate and bench-test every unit. Delivery, return flow, opening pressure and leakage are recorded, and units outside specification are not dispatched. Test sheets available on request, and every unit carries a 12-month warranty.
| Part number | 5WS40539 |
| Condition | Remanufactured (not a genuine OEM new part) |
| Cross-reference | 5WS40539, A2C59513554, 03L130277B |
| Process | Disassembled, cleaned, measured, wear parts replaced, machined to specification |
| Bench test | Delivery, return flow, opening pressure and leakage recorded before dispatch |
| Warranty | 12 months |
How to tell a failing common rail injector from compression, turbo and air-side faults — and why the cheap checks come first.
Read the guide →Three very different things are sold under similar descriptions. Here is what separates them, and what to ask before you buy.
Read the guide →What the digits on your injector actually mean, why several numbers fit the same part, and how to avoid ordering the wrong one.
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