BK2Q-9K546-AG — Frequently Asked Questions
Verified answers about the Siemens VDO BK2Q-9K546-AG (A2C59517051 / 5WS40745) Ford 2.2 TDCi Puma Piezo Injector.
What is injector BK2Q-9K546-AG?
A Siemens VDO / Continental piezo common-rail diesel injector for the Ford 2.2 TDCi Duratorq 'Puma' (P22DTE) engine. Continental number A2C59517051, Siemens 5WS40745, Land Rover LR032067.
Which vehicles use BK2Q-9K546-AG?
Ford Transit and Transit Custom 2.2 TDCi (2011-2016) and Land Rover Defender 2.2 Puma, plus PSA 2.2 HDi vans (verify by VIN).
Is this a Bosch or Siemens injector?
It is a Siemens VDO / Continental piezo injector. Some other Ford 2.2 diesels use Bosch, so match by the old part number and engine code.
Is it a piezo or solenoid injector?
It is a piezoelectric injector and needs a Siemens/VDO/Continental-capable test bench.
What is the Continental number for BK2Q-9K546-AG?
A2C59517051 (Siemens 5WS40745); Land Rover lists it as LR032067.
Does BK2Q-9K546-AG fit the 2.0 EcoBlue?
No. This is the 2.2 TDCi Puma injector. The later 2.0 EcoBlue uses a different injector - confirm by engine code, not vehicle badge.
Do I need to code the injector after fitting?
Yes. Programme the injector correction/coding values with Ford IDS or Land Rover diagnostics after replacement, or the engine will run rough.
What are the symptoms of a failing BK2Q-9K546-AG?
Hard starting, rough running/knock, limp mode, low rail-pressure codes, smoke and higher fuel consumption.
Why does my 2.2 TDCi go into limp mode?
Excessive injector spill (back-leakage) lowers rail pressure and triggers a protective derate. A leak-off test confirms a leaking injector.
Can I test BK2Q-9K546-AG on a Bosch bench?
No - it is a Siemens VDO piezo injector and requires a Siemens/VDO/Continental-capable bench.
Should I replace one or all injectors?
Diagnose each with a leak-off test and live correction values; on high-mileage Transit/Defender engines failures often cluster, so check all.
Why check the fuel filter before fitting?
Fuel contamination is a common cause of failure; replacing the filter and clearing contamination protects the new injectors.
Why renew the copper washer?
It is a one-use crush seal; reusing it risks combustion blow-by and carbon build-up around the injector base.
Does a remanufactured BK2Q-9K546-AG perform like new?
A properly remanufactured piezo injector is bench-tested and recalibrated to the Siemens plan to meet original delivery and spill specs.