A2C59507596 — Technical Research
Continental (Siemens VDO) piezo common-rail injector for the Renault-Nissan K9K 1.5 dCi engine, also used on Dacia and the Mercedes OM607 (rebadged K9K). Renault OE 166006212R; alternates 8201041272/166006526R; Mercedes A6070700087. Replacements are coded to the ECU with the injector classification (C2I) code. Failures are driven by poor fuel filtration, contamination and back-leakage. Key symptoms: Rough idle / vibration; Hard starting; Loss of power / limp mode; Black smoke. Common failure modes: Internal wear / high back-leakage; Piezo stack degradation; Nozzle coking.
Continental/Siemens VDO A2C59507596 1.5 dCi (K9K) Piezo Common Rail Injector (Renault/Nissan/Dacia/Mercedes)
Continental (Siemens VDO) piezo common-rail injector for the Renault-Nissan K9K 1.5 dCi engine, also used on Dacia and the Mercedes OM607 (rebadged K9K). Renault OE 166006212R; alternates 8201041272/166006526R; Mercedes A6070700087. Replacements are coded to the ECU with the injector classification (C2I) code. Failures are driven by poor fuel filtration, contamination and back-leakage. Key symptoms: Rough idle / vibration; Hard starting; Loss of power / limp mode; Black smoke. Common failure modes: Internal wear / high back-leakage; Piezo stack degradation; Nozzle coking.
A leaking injector unbalances cylinder fuelling on the 1.5 dCi K9K.
Excess back-leakage drops cranking rail pressure.
Out-of-range delivery or rail-pressure deviation cuts power.
Poor atomisation over-fuels the cylinder.
Cylinder-specific injector or fuel-metering codes.
- InstallationCode the injector classification (C2I) code to the correct cylinder with CLIP/diagnostic before road test.
- InstallationRenew the copper combustion washer and leak-off seals; torque the clamp to spec.
- MisdiagnosisRead live back-leakage / cylinder-balance data to find the weak cylinder before removal.
- WarningThe K9K is very sensitive to fuel contamination - replace the fuel filter and check for water-in-fuel first.
- TestingBench-test on a piezo-capable CR tester; verify response and spray pattern before refit.
What is injector A2C59507596?+
A Continental (Siemens VDO) piezo common-rail diesel injector for the Renault-Nissan K9K 1.5 dCi engine, also used on Dacia and the Mercedes OM607. Renault OE 166006212R.
Which vehicles use A2C59507596?+
Renault Megane/Clio/Captur/Kadjar, Nissan Qashqai II/Juke, Dacia Duster/Logan/Sandero and Mercedes A/B/CLA/GLA 1.5 dCi/CDI (K9K / OM607).
Is it solenoid or piezo?+
It is a Continental/Siemens VDO piezo common-rail injector.
Does A2C59507596 need coding?+
Yes - code the injector classification (C2I) code to the correct cylinder with CLIP/diagnostic when fitting.
What are the OE part numbers?+
Renault 166006212R, Dacia 8201041272 and Mercedes A6070700087 reference this Continental injector; alternates include 166006526R and H8201100113.
Does it fit the Mercedes 1.5 CDI?+
Yes - the Mercedes OM607 1.5 CDI in the A/B/CLA/GLA is a rebadged Renault K9K and uses the same Continental injector.
What are the symptoms of failure?+
Rough idle, vibration, hard starting, black smoke, power loss/limp mode and an EML.
Why does my 1.5 dCi run rough?+
A worn or leaking injector unbalances fuelling; read live cylinder-balance data and bench-test the suspect cylinder.
What causes these injectors to fail?+
Poor fuel filtration, contamination and back-leakage wear plus piezo-stack ageing - fix the cause first.
Does a remanufactured A2C59507596 perform like new?+
A properly remanufactured injector is bench-tested and recalibrated on a piezo-capable tester, then C2I-coded on fitment.