What is a pump-duse (PD) injector?

A PD injector combines the fuel pump and injector into one unit. Each injector is mechanically driven by the engine camshaft, unlike common-rail which uses a shared high-pressure pump.

How much does BKD PD injector replacement cost?

A single PD injector costs £200-£400. Labour is more intensive than common-rail due to camshaft alignment requirements.

Can I fit common-rail injectors to a PD engine?

No. PD and common-rail are fundamentally different systems. Only PD injectors are compatible.

How much does it cost to replace injectors?

Replacement typically costs £150–£350 per injector depending on brand and engine. A full set of four with professional fitting usually costs £600–£1,200.

Can I drive with a faulty injector?

Driving with a faulty injector can cause engine damage, increased fuel consumption, DPF contamination, and oil dilution. We recommend diagnosis and replacement as soon as possible.

Do new injectors need coding?

Some vehicles require injector coding after replacement using manufacturer-specific diagnostic tools. Many Bosch solenoid units are plug and play. Check your engine guide for specific requirements.

Why is my diesel injector knocking?

Diesel injector knocking is typically caused by worn nozzle tips that alter the fuel spray pattern, leading to harsher combustion. Carbon buildup, incorrect injection timing, and high fuel pressure can also contribute. A professional leak-off test can confirm whether injectors are the cause.

Can a bad injector cause white smoke?

Yes. A faulty injector that dribbles fuel instead of atomising it causes incomplete combustion, producing white or grey smoke. This is especially noticeable on cold starts and typically clears as the engine warms up.

How long do diesel injectors last?

Most diesel injectors last between 80,000 and 150,000 miles depending on fuel quality, driving conditions, and maintenance. Regular fuel filter changes and using quality diesel can extend their lifespan.

Will injector cleaner fix misfire?

Injector cleaner may help with minor carbon deposits, but it cannot fix worn nozzles, failed solenoids, or internal seal leaks. If misfire persists after using cleaner, professional testing and likely replacement is needed.

VW BKD 2.0 TDI PD Injector Problems: Symptoms & Repair (UK)

Updated for 2026 diagnostics & repair guidance

Pump-duse technology — fundamentally different from common-rail. Cannot be interchanged.

The BKD is VW Group's 2.0 TDI 16-valve pump-duse (PD) engine. Unlike common-rail engines, it uses unit injectors with integrated fuel pumps. Found in the Golf Mk5, Audi A3, and Skoda Octavia. PD injector failure is common and relatively expensive to repair.

OEM tested & calibrated12-month warrantyFree UK deliveryNo coding required (most models)

OEM Tested
12-Month Warranty
Free UK Delivery

Registration Lookup Find Matching BKD Injector

Drivers also ask

Quick Diagnosis

If your BKD engine shows:

rough idle
hard starting
white or black smoke
knocking or ticking noise
reduced fuel economy

A faulty injector may be the cause. Continue below to confirm symptoms and solutions.

Can You Drive With This Problem?

Driving short distances may be possible, but continued use can cause:

piston damage
turbo contamination
fuel dilution of engine oil
catalytic converter damage

Prolonged driving may lead to major engine failure.

Typical Repair Costs (UK)

Average costs for injector-related repairs:

£180 - £350

Per Injector

£700 - £1,200

Full Set (4)

£120 - £300

Labour

Early replacement prevents costly engine damage.

Common Injector Failure Symptoms

Owners frequently report:

Loud ticking/knocking from engine

PD injectors are mechanically noisy by design, but excessive knocking indicates wear.

Misfire and rough running

Worn PD elements fail to generate sufficient pressure for proper injection.

Power loss and flat spots

Failed PD injectors cannot deliver fuel at the required pressure and timing.

Engine management light with misfire codes

P0300-P0304 misfire codes are common with PD injector failure.

Full symptom guide White smoke guide

Fault Codes Linked to Injector Issues

Common diagnostic codes include:

P0300-P0304Random/cylinder-specific misfire

P0201-P0204Injector circuit malfunction

P2146Fuel injector group supply voltage

Misfire diagnosis guide

How to Diagnose BKD Injector Faults

Follow this step-by-step testing approach to identify the faulty injector:

1
Read fault codes
Connect an OBD-II scanner and note any injector-related codes (P0201–P0204, P2146, P2149). This identifies which cylinder is affected.
2
Perform a leak-off test
Disconnect the fuel return pipes and route into measuring containers. Run the engine at idle for 60 seconds. Compare volumes per cylinder against manufacturer spec.
3
Listen for injector tick
Use a mechanic's stethoscope on each injector body. A dead or irregular tick indicates a stuck or failing solenoid.
4
Check fuel rail pressure
Monitor live fuel rail pressure data via diagnostic tool. Low pressure can mimic injector symptoms and may indicate a fuel pump issue instead.
5
Inspect for external leaks
Check around injector seals for signs of fuel or combustion gas leakage. Black carbon deposits indicate a blown seal.
6
Cylinder balance test
Use diagnostic software to run a cylinder contribution test. This electronically disables each injector in turn to measure its effect on engine speed.

Full leak-off test guide Injector coding guide

Why BKD Injectors Fail

Common causes include:

fuel contamination
high-pressure wear cycles
carbon buildup
poor fuel quality
internal valve wear

Professional remanufacturing restores spray pattern and pressure accuracy.

When Replacement Is Required

Injector replacement is recommended if:

leak-off test fails
misfire persists after coding
excessive return flow detected
spray pattern fails testing
vehicle enters limp mode

BKD Repair Advice

PD injectors require the camshaft lobe to be in the correct position during removal and installation. Torque to 40 Nm. Electronic coding via VCDS is required after replacement.

Remanufactured (Recommended)

OEM-spec rebuild with new nozzles, seals, and solenoids. Full flow testing. 12-month warranty. 40–60% less than new.

Brand New OEM

Factory-fresh from Bosch, Delphi, or Siemens. Highest cost but zero previous wear. Best for low-mileage vehicles.

Vehicles Using the BKD Engine

This engine is commonly found in:

Volkswagen Golf Mk5

1.9/2.0 TDI PD · 2003-2008

Audi A3

8P 2.0 TDI PD · 2003-2008

SEAT Leon

Mk2 2.0 TDI PD · 2005-2009

Skoda Octavia

Mk2 2.0 TDI PD · 2004-2008

Volkswagen Passat

B6 2.0 TDI PD · 2005-2008

Professional Installation Tip

Always:

replace copper sealing washers
torque injectors to manufacturer specification
clean injector seats before installation
code injectors after installation (if required)

Leak-off test guide Injector coding guide

Compatible Injector Part Numbers for BKD

The following injector part numbers are commonly associated with BKD engines:

0414720404

Bosch PD unit injector for BKD

£80.00View details

03G130073G

VW OE reference

£80.00View details

Also commonly fitted:

0414720210Bosch

BKD Injectors — Shop Now

In-stock injectors listed first for fastest delivery:

AUDI A3 ( A3 S Line Final Edition TDI 8P7) 1.6L 2013-2013 Diesel Injector

£150.00

In StockNext-day delivery12 months

AUDI A3 ( A3 S Line Final Edition TDI 8P7) 2L 2013-2013 Diesel Injector

£350.00

In StockNext-day delivery12 months

AUDI A3 ( A3 S Line TDI 8V1) 2L 2012-2015 Diesel Injector

£350.00

In StockNext-day delivery12 months

AUDI A3 ( A3 1.9 TDI A4) 1.9L 1997-2001 Diesel Injector

£1.00

Made to order12 months

AUDI A3 ( A3 1.9 TDI AUTO A4) 1.9L 1997-2000 Diesel Injector

£100.00

Made to order12 months

AUDI A3 ( A3 104 TDI 8P1) 1.9L 2008-2009 Diesel Injector

£100.00

Made to order12 months

AUDI A3 ( A3 E 104 TDI 8P1) 1.9L 2008-2009 Diesel Injector

£100.00

Made to order12 months

AUDI A3 ( A3 E SE TDI 8P1) 1.9L 2009-2010 Diesel Injector

£100.00

Made to order12 months

View all BKD injectors

These injectors are commonly used with the BKD engine. Confirm compatibility using your engine code or registration lookup before ordering. Our team can verify the correct part for your specific vehicle.

Helpful Guides

Reconditioned injectors guide

How remanufactured injectors are tested & warranted

Injector warranty guide

What's covered & how to claim

UK delivery & fitment help

Free next-day delivery & part-number checks

Find Your Exact BKD Injector

Three quick ways to confirm the right part:

Registration Lookup

Enter your reg to find the exact part

Engine Code Search

Search using BKD

Same-day dispatch before 2pm12-month warranty includedOEM tested & calibrated

Not sure which injector? Call us on 020 3355 6581.

Frequently Asked Questions

Injector Symptoms

Spot the warning signs of a failing diesel injector

Injector Fault Codes

P0201–P0204 injector circuit codes explained

Smoke Diagnosis

White & blue smoke causes and fixes

Injector Testing

Leak-off & bench testing methods

Replacement Cost

UK parts + labour cost breakdown

Misfire Diagnosis

Why injectors cause rough running & misfires

CAYC Injector Problems

Volkswagen Group (VW/Audi/SEAT/Skoda)

CBAB Injector Problems

Volkswagen Group

CFFB Injector Problems

Volkswagen Group

CLHA Injector Problems

Volkswagen Group

BXE Injector Problems

Volkswagen Group

OM651 Injector Problems

Mercedes-Benz

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Remanufactured Injectors

OEM-rebuilt, every wear part replaced, 12-month warranty

Reconditioned Injectors

Bench-tested, calibrated, UK same-day dispatch

Refurbished Injectors

Cleaned, nozzle-replaced, flow-tested — cheaper than reman

Used Diesel Injectors

Read this before you buy — risks, checks, real cost

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Remanufactured vs New

Same lifespan, 40–60% cheaper — when reman wins, when new wins

Replacement Cost UK 2026

Parts + labour + coding — per-engine UK pricing tables

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VW BKD 2.0 TDI PD Injector Problems: Symptoms & Repair (UK)

Drivers also ask

Quick Diagnosis

Can You Drive With This Problem?

Typical Repair Costs (UK)

Common Injector Failure Symptoms

Loud ticking/knocking from engine

Misfire and rough running

Power loss and flat spots

Engine management light with misfire codes

Fault Codes Linked to Injector Issues

How to Diagnose BKD Injector Faults

Read fault codes

Perform a leak-off test

Listen for injector tick

Check fuel rail pressure

Inspect for external leaks

Cylinder balance test

Why BKD Injectors Fail

When Replacement Is Required

BKD Repair Advice

Remanufactured (Recommended)

Brand New OEM

Vehicles Using the BKD Engine

Professional Installation Tip

Compatible Injector Part Numbers for BKD

BKD Injectors — Shop Now

Helpful Guides

Find Your Exact BKD Injector

Frequently Asked Questions

Related Guides

Related Engine Problems

Other Engine Guides

Related commercial guides

Buyer-intent comparisons