Question 1

How much is an injector for an INFINITI Q50?

Accepted Answer

An exchange injector for the INFINITI Q50 starts at €88.00. This model takes 2 different references depending on the engine and the production period; the price shown is the lowest of them.

Question 2

Which injector reference fits an INFINITI Q50?

Accepted Answer

An INFINITI Q50 does not take a single reference: 2 references coexist depending on the engine and the production period. The code read on the removed part is what names yours — not the vehicle's trade name, nor its year.

Question 3

Why are several injector references offered for the Q50?

Accepted Answer

Because one model covers several engines, and one engine may have been built with different injectors depending on the production period or the original supplier. Each of the 2 references matches a precise variant of the vehicle.

Question 4

Where is the reference found on an injector removed from an INFINITI Q50?

Accepted Answer

It is engraved on the injector body. The marking stays readable even on a part coated with soot. It is the only reading that confirms the match with the reference expected on an INFINITI Q50.

Question 5

How do I find out which engine my Q50 has?

Accepted Answer

The registration document states the version and the rated power of the vehicle; the engine code itself is stamped on the block. That engine-and-power pairing places the car within the Q50 range, and leads to the right injector reference.

Question 6

Is the year of my Q50 enough to choose the injector?

Accepted Answer

No. Two Q50 of the same year can take different injectors depending on their engine. It is the engine-and-power pairing that determines the reference, and the code on the removed part that confirms it.

Question 7

What happens to the old injector from my INFINITI Q50?

Accepted Answer

The part ordered is sold as an exchange unit: it has already been remanufactured, and the injector you remove from the Q50 goes back into the reconditioning circuit. Return terms are stated at checkout.

Question 8

How does an exchange injector differ from a new part?

Accepted Answer

An exchange injector is an original part restored to working order: wear parts are replaced and the part is bench-tested. It carries the same reference as the injector removed from the Q50 and fits in its place.

Question 9

How do I spot a worn injector on an INFINITI Q50?

Accepted Answer

On an INFINITI Q50, a clogged or worn injector shows up as misfires under acceleration, black smoke at the exhaust, higher fuel consumption and an unstable idle. These signs overlap with other fuel system faults: diagnosis is a job for a qualified technician.

Question 10

Why does my Q50 go into limp mode?

Accepted Answer

The ECU of the Q50 limits the engine when injection pressure no longer matches what the engine expects. An injector that no longer meters correctly, or whose leak-off return is excessive, is one possible cause.

Question 11

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 12

Should every injector on a Q50 be replaced at the same time?

Accepted Answer

That is the rule on a common rail engine: the injectors of one engine have run the same number of cycles, and a worn part wears the others. They are replaced as a full set as soon as one fails, with the reference matching the engine fitted to the Q50.

Question 13

How do I confirm the fault before ordering an injector for the Q50?

Accepted Answer

By a fault code read and a leak-off flow test, carried out by a qualified technician, before any order for an INFINITI Q50. That check names the part at fault and separates it from a pressure fault elsewhere in the fuel system — faults with similar symptoms but different remedies.

Question 14

Can I order an injector for the Q50 without knowing the exact reference?

Accepted Answer

The 2 references on this page cover the engines fitted to the Q50: the choice is made by reading the code engraved on the removed part. Without that reading, the exact engine of the vehicle has to be identified before ordering.

Question 15

Does an injector ordered for an INFINITI Q50 fit straight on?

Accepted Answer

Yes, provided the reference is the original fitment for the engine in the Q50, and the part comes with the matching seal. Fitting and coding to the ECU are a job for a qualified automotive technician.

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Injector SIEMENS-VDO 5WS40536

High-pressure pump SIEMENS-VDO 5WS40019

Fuel injector INFINITI Q50

Available products

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Injector DELPHI R00002D

Frequently asked questions

About this category

Diagnostics and wear symptoms

Core deposit and exchange procedure

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