Getting injector repairs right with DENSO

19 June 2018 | Article

Not just any workshop can undertake fuel injector repairs, according to DENSO.

The fuel injection system is at the heart of any diesel engine, pressurising and injecting the fuel to power an estimated 12.4 million vehicles across the UK. Yet like any essential component, it can often suffer the effects of wear and tear over time, eventually encountering problems which will require an injector repair. And with the average UK diesel car nearly seven years old* and diesel engines accounting for 40% of all licensed cars, fuel injection system repair can prove a fruitful source of revenue for repairers. However, the precise nature by which the fuel injector works also means that repairers need to ensure they are carrying out a repair in the right conditions. If not they may end up causing further, not to mention costly, damage.


Workshop Standards

It’s common knowledge that genuine OE aftermarket parts are high quality and durable, keeping customers happy while safeguarding a workshop’s reputation. But, like all parts, their lifespan will be limited, and they may at some point need to be repaired. In the case of the fuel injector, the success of a repair can prove just as dependent on skills and training as it is on the conditions of the workshop.

Due to the working clearances of 2 microns cleanliness is crucial when it comes to repairing an injector, The capital investment for the facilities and testing equipment is extremely high but necessary to meet the exacting standards of DENSO.

To repair an injector it must be dismantled, cleaned precisely and then re-assembled in an air-conditioned, pressurised, clean room. It may seem overly cautious, but the reasoning is well founded. Even the smallest piece of dirt can contaminate a fuel injector’s nozzle which could cause it to stick in the open position. If this happens, the injector will leak fuel into the cylinder causing expensive damage to the engine and a furrowed brow of the customer when they are presented with the final bill.

 Fuel Injectors (1)

DENSO Approved

To ensure workshops can guarantee a high quality repair of a DENSO injector, the parts manufacturer requires workshops to meet a stringent list of standards including investment in their facilities and testing equipments to ensure strict cleanliness in the area where the injector repair takes place. At present there are only a handful of authorised DENSO injector repairers in the UK and Ireland who have developed the required conditions.

Currently there are five authorised DENSO injector repairers in England (Merlin Diesel, Carwood, Colchester Fuel Injection, Feather Diesel & CP Diesel) and two in Ireland (Diesel Injection Services, Diesel Engineering Services).

Labelled Injector (1)

DENSO Injectors

A genuine DCRI (DENSO Common Rail Injector) can always be identified by the following:

-       First digit stands for injector type: 1 for 095000-, 2 for 295900-, 3 for 295050-

-       Second digit is filling digit

-       Basic part number of original DENSO part number

To ensure an efficient repair of a genuine DENSO injector while avoiding the risk of more costly damage to an engine, DENSO recommends visiting one of its authorised injector repairers.

Further Information

For further information about DENSO’s range of diesel fuel injectors visit:

 For DENSO’s UK Aftermarket site please visit:

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