Question 1

How much is an injector for a FORD Focus 2.0 TDCi 136 hp?

Accepted Answer

A remanufactured injector for the FORD Focus 2.0 TDCi 136 hp starts at €140.83 per unit. This engine takes 4 different references: the price shown is the lowest, the others varying by supplier or production period.

Question 2

Which injector reference fits the 2.0 TDCi 136 hp?

Accepted Answer

The references are 5WS40156-4Z, 5WS40156-5Z, 5WS40156-6, 5WS40156-Z. They are what settle the match on a FORD Focus 2 with the 2.0 TDCi 136 hp engine — not the vehicle's trade name, nor its year.

Question 3

Why are several references offered for the 2.0 TDCi 136 hp?

Accepted Answer

Because this engine was built with several injector types depending on the production period or the original supplier. Each reference matches a precise variant; the code read on the removed part settles which one fits.

Question 4

Where is the reference found on an injector removed from a Focus 2?

Accepted Answer

It is engraved on the brass body. Brass holds the engraving even on a part fouled with soot. It is the only reading that confirms the match with 5WS40156-4Z.

Question 5

What happens to the old injector from a FORD Focus 2.0 TDCi 136 hp?

Accepted Answer

Part 5WS40156-4Z is sold as an exchange unit: it has already been remanufactured and bench-tested, and the injector you remove goes back into the reconditioning circuit. Return terms are stated at checkout.

Question 6

How does exchange injector 5WS40156-4Z differ from a new part?

Accepted Answer

An exchange injector is an original part restored to working order: wear parts are replaced, then flow and spray pattern are checked on a test bench. It carries the same reference, 5WS40156-4Z, and fits in place of the part removed.

Question 7

Does injector 5WS40156-4Z fit every Focus 2?

Accepted Answer

No: it matches Focus 2 models fitted with the 2.0 TDCi 136 hp engine. A Focus 2 running on petrol, or at a different diesel power output, takes another reference.

Question 8

Is the year of my Focus enough to choose the injector?

Accepted Answer

No. Two Focus of the same year can take different injectors depending on their engine. It is the engine-and-power pairing — here 2.0 TDCi 136 hp — that determines the reference, and the code on the removed part that confirms it.

Question 9

How do I spot a worn injector on a Focus 2.0 TDCi 136 hp?

Accepted Answer

On this diesel engine, a fouled or worn injector shows up as misfires under acceleration, black smoke at the exhaust, higher fuel consumption and a rough idle. These signs overlap with other fuel system faults: diagnosis is a job for a qualified technician.

Question 10

Why does my Focus 2.0 TDCi 136 hp go into limp mode?

Accepted Answer

On this 2.0 TDCi 136 hp, the ECU limits the engine when injection pressure no longer matches what is expected for the 136 hp rated output. An injector that no longer meters correctly, or whose leak-off is excessive, is one possible cause.

Question 11

What does exhaust smoke mean on a 2.0 TDCi 136 hp?

Accepted Answer

On this 2.0 TDCi 136 hp diesel engine, black smoke means an over-rich burn — an injector that dribbles or sprays poorly is one candidate; persistent white smoke when cold points instead to a combustion fault. Colour guides the diagnosis, it does not replace it.

Question 12

Does a knock at idle always come from the injector?

Accepted Answer

No. The knock can come from the injector itself, but equally from the common rail, a leak-off return line or the glow plugs. Noise alone is not enough to condemn the part.

Question 13

Should all injectors be replaced together on a common rail engine?

Accepted Answer

That is the rule on this type of engine: injectors age together, and one tired part wears the others. Replacement is done as a full set as soon as one fails, using reference 5WS40156-4Z for this 2.0 TDCi 136 hp.

Question 14

How do I confirm the fault before ordering injector 5WS40156-4Z?

Accepted Answer

By a fault code read and a leak-off test, carried out by a qualified technician, before any order of reference 5WS40156-4Z. That check points to the injector at fault and separates it from a pressure fault coming from the pump — two faults with similar symptoms but different remedies.

Question 15

Does injector 5WS40156-4Z fit straight onto a 2.0 TDCi 136 hp?

Accepted Answer

Yes: reference 5WS40156-4Z is the original fitment for a FORD Focus 2 with the 2.0 TDCi 136 hp engine, and it ships with the matching seal. Fitting and coding the injector to the ECU are a job for a qualified automotive technician.

Turbo Garrett 753420-5006S

Injector SIEMENS-VDO 5WS40536

High-pressure pump SIEMENS-VDO 5WS40019

Fuel injector FORD Focus 2 2.0 TDCi 136 hp

Available products

Injector SIEMENS-VDO 5WS40156-4Z

Injector SIEMENS-VDO 5WS40156-5Z

Injector SIEMENS-VDO 5WS40156-6

Injector SIEMENS-VDO 5WS40156-Z

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