Diesel injector replacement cost — UK 2026 guide

The headline ranges, before we get into the maths: £260–£420 per cylinder all-in for a reman replacement, £140–£220 for the part itself, £80–£140 for labour. A full 4-cylinder reman set typically lands between £900 and £1,500 all-in on a passenger-car common-rail engine. This guide breaks down each number with the workshop-grade reasoning behind it so you can sanity-check any quote you get — and spot the four common ways a quote gets inflated.

Parts cost — per injector

Part type	UK retail (typical)	Notes
New OEM (common rail solenoid)	£280–£420	Brand premium + warranty included
New OEM (piezo)	£420–£700	BMW N57, Mercedes OM651/OM642, premium CR3
Remanufactured (solenoid)	£140–£220	12-month warranty, test sheet, coding code on body
Remanufactured (piezo)	£180–£280	Same warranty as new OEM in most cases
Refurbished	£100–£160	Nozzle + seals replaced, lighter process
Used (no test sheet)	£30–£80	No warranty, no calibration — significant risk

Labour cost — per injector

UK independent workshop rates in 2026 average £55–£95 per hour outside London / £85–£140 inside London. A single common-rail injector replacement is typically 1.0–1.5 hours of work, putting labour at £80–£140 per cylinder. PD-TDI units (rocker cover off, valvetrain involvement) run 1.5–2.0 hours per cylinder, so labour climbs to £110–£190 on those engines. Coding after fitment is typically a 15-minute task included in the labour quote — make sure it's confirmed in writing before booking.

All-in repair cost — by engine

Engine family	Single reman	Full set of 4	Set of 6
VW 1.6/2.0 TDI common-rail	£220–£340	£880–£1,360	n/a
VW 1.9/2.0 PD-TDI	£260–£400	£1,040–£1,600	n/a
BMW N47 2.0d (Bosch CRIN piezo)	£280–£420	£1,120–£1,680	n/a
BMW N57 3.0d (piezo)	£320–£480	n/a	£1,920–£2,880
Mercedes OM651 2.1 CDI	£260–£400	£1,040–£1,600	n/a
Mercedes OM642 3.0 CDI	£300–£450	n/a	£1,800–£2,700
Ford TDCi 2.0/2.2 (Delphi)	£240–£360	£960–£1,440	n/a
Toyota 1KD-FTV 3.0 D-4D (Denso)	£280–£420	£1,120–£1,680	n/a
Peugeot / Citroën 1.6 HDi (Delphi)	£220–£340	£880–£1,360	n/a
Vauxhall 1.7 CDTi (Denso)	£240–£360	£960–£1,440	n/a

Extras to budget for

Fuel filter: £25–£60. Always replace when changing injectors — it's the single biggest factor in new-injector lifespan.
Copper sealing washers: £8–£20 per cylinder. Reman units usually ship with them; new OEM may not. Single-use, never reuse the old ones.
Return-line / leak-off pipes: £15–£40 if cracked or hardened. Inspect during removal — they harden with age.
Diagnostic time: £40–£90 if the cylinder needs confirmation. Often included in the quote on straightforward jobs.
Stuck injector extraction: on high-mileage engines, an injector can seize in the bore. Add £80–£200 of recovery time and a possible thread chase if the body cracks during extraction.
Cam-follower replacement (PD-TDI only): £15–£30 per follower, half an hour additional labour. Always replace on PD-TDI when changing injectors.
High-pressure pump check: £20–£40 of diagnostic time. Mandatory if there's any history of fuel contamination or HP-pump swarf — the same contamination that killed the injector may have damaged the pump.

How to keep the bill realistic

Choose reman over new — same lifespan, 40–60% cheaper. The engineering case for new OEM disappears after the manufacturer warranty expires.
Bench-test the remaining injectors when one fails. Replace the set only if balance is out across multiple cylinders.
Always replace the fuel filter at the same time. Skipping this is the #1 reason for repeat failures.
Use an independent specialist for older diesels — main-dealer rates for 10+ year vehicles rarely make sense given the labour rate gap (£140/hr dealer vs £75–£95/hr independent).
Confirm coding is included in the labour quote. Some workshops bill it separately at £40–£90.
Take a written quote before authorising. Verbal "around £900" quotes routinely arrive at £1,250+ once "extras" appear.

Four common quote inflations to watch for

"Full set" recommended on a single-cylinder fault. On a clean balance test of the other three cylinders, replacing the set adds £600–£1,100 of parts that aren't faulty. Demand bench-test data on the other three before authorising a full set.
Coding billed separately at £55–£90. Standard practice is to include coding in the labour quote. Separate billing is a £50+ markup for a 15-minute task already covered by your hourly rate.
HP pump replacement bundled without diagnostic evidence. An HP pump fails dramatically — the symptoms include metal swarf at the rail outlet and rail-pressure faults. Replacement without that evidence is £400–£900 of unnecessary parts.
New OEM parts on an out-of-warranty vehicle. Outside the manufacturer warranty there is no engineering benefit to new OEM. Quotes specifying new OEM on a 10-year-old vehicle are paying for brand markup, not performance.

Regional pricing across the UK

Independent labour rates vary meaningfully across the UK. London inner-zone independents charge £110–£140/hr. London outer zones and the Home Counties run £95–£120. Manchester, Birmingham, Bristol, Leeds, Sheffield, Newcastle, Liverpool sit at £70–£95/hr. North Wales, Cornwall, rural Scotland and most of Northern Ireland are £55–£75/hr. The parts cost is regionally invariant — reman injectors ship UK-wide same-day from central warehouses. So the regional variation in the all-in repair cost is essentially the labour rate, multiplied by the 1.0–2.0 hours per cylinder. On a 4-injector job, that's a swing of £160–£320 between a North Wales rural independent and a central London independent — for identical parts.

How to think about reman vs new on UK pricing

Pros

Reman saves £500–£1,500 on a typical 4-cylinder common-rail job vs new OEM
UK reman supply is same-day before 2 pm from specialist warehouses
12-month warranty with no mileage cap from specialist UK suppliers
Per-unit test sheet ships with every reman injector
Fits exactly like new OEM — no fitment difference, no coding difference

Cons

Core return paperwork — £25–£60 credit, prepaid label included
Not eligible inside some manufacturer warranties (check wording)
Quotes need scrutiny — see the four common inflation patterns above

Browse by affected engine family

Frequently asked questions

How much does it cost to replace a diesel injector in the UK?

Single-cylinder all-in: £220–£420 for a reman replacement with labour and coding. A full set of 4 lands £900–£1,500 on most passenger-car common-rail engines; piezo families and PD-TDI engines run 15–30% higher.

Why are some diesel injectors so much more expensive than others?

Piezo injectors (CRI3, certain BMW/Mercedes families) use a piezo-stack actuator which is more expensive than a solenoid coil. Heavy-duty truck and commercial-vehicle injectors also carry a premium for higher-flow nozzles and tougher build.

Is it cheaper to replace one injector or all four?

One — if the others test in spec. Bench-test the remaining injectors and replace only the failed one. Replace the set only if multiple test out of balance; doing both jobs in one strip-down is cheaper than two separate visits.

Are reman injectors really 40–60% cheaper than new?

Yes — typical reman retail is £140–£220 vs £280–£420 for new OEM solenoid units, and the gap is wider on piezo families. Lifespan is the same; the cost saving comes from reusing the OEM body.

What's the cheapest way to replace diesel injectors safely?

Reman units with a 12-month warranty and a printed test sheet. Used injectors look cheaper upfront but the second-visit failure rate makes them more expensive on a 24-month total-cost-of-ownership basis.

Does the workshop charge extra for ECU coding after fitment?

Sometimes — typically £40–£90 if billed separately. Always confirm whether coding is included in the labour quote before booking. Standard practice is to include it.

Does diesel injector replacement cost more in London?

Yes — the labour rate is roughly 50–80% higher in central London than in regional UK independents. On a 4-injector job that's a £160–£320 swing for identical parts.

How much should I budget for a 4-cylinder van injector replacement?

£900–£1,400 reman, £1,500–£2,000 new OEM, including labour, sealing kit, fuel filter and coding. PD-TDI vans run 15–25% higher due to additional labour.