2004 Injector Problems – Symptoms, Causes & Fixes

Engine: 2004 90 compatible injectors From £150

Common Injector Failures on the 2004

The 2004 engine uses high-pressure common rail diesel injection. Over time, injector nozzles wear, seals degrade, and internal components lose calibration. This leads to a range of drivability symptoms that worsen if left unaddressed. We stock 90 tested replacement injectors for this engine from Bosch.

Vehicles fitted with the 2004 include models from AUDI, Audi. If you are experiencing any of the symptoms below, your injectors may need testing or replacement.

Symptoms of Injector Failure

Related Fault Codes

P0201 P0202 P0203 P0204 P0263 P0266 P0269 P0087 P0089 P0300

How to Test 2004 Injectors

Leak-off test: Connect clear hoses to the injector return lines and compare fuel volumes at idle. The injector returning the most fuel is likely worn.

Correction values: Use a scan tool to read injector correction (IMA) values. Readings beyond ±3 mg/stroke indicate wear.

Resistance check: Measure resistance across the injector connector pins with a multimeter. Compare to manufacturer specs.

Complete Testing Guide Leak-Off Test Guide

2004 Injector Replacement Cost

Parts (per injector)

£150–£150

Labour

£150–£400

Total (per injector)

£300–£550

Full replacement cost guide

Compatible Injectors for the 200490 found

Most Common Injector Part Numbers for 2004 Engine

Related Cross Reference Numbers for 2004

038130073BJ 038130079QX 0414720229 0986441524

Vehicles Using the 2004 Engine

AUDI A42004

Audi A42004

Related Engine Codes

2000 8E2 8E5 8EC 8ED 8HE

Frequently Asked Questions

What are common injector problems on the 2004 engine?

The 2004 engine commonly suffers from injector seal failure, nozzle wear causing poor spray patterns, and back-leak issues. Symptoms include rough idle, black or white exhaust smoke, hard starting, and increased fuel consumption. These issues typically appear after 100,000–150,000 miles.

How much does it cost to replace injectors on a 2004 engine?

A remanufactured injector for the 2004 engine typically costs £150–£150 per injector. Labour adds £150–£400 depending on accessibility. We found 90 compatible injectors for this engine.

Which vehicles use the 2004 engine?

The 2004 engine is found in vehicles from AUDI, Audi. Common models include AUDI A4, Audi A4.

How do I test the injectors on a 2004 engine?

Perform a leak-off test by connecting clear hoses to each injector return line and comparing fuel volumes at idle. You can also check injector correction values with a diagnostic scan tool or measure electrical resistance with a multimeter.

Injector Compatibility Checker

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Need a Replacement 2004 Injector?

We stock 90 tested replacement injectors for the 2004 engine. All remanufactured, bench-tested, and supplied with a 12-month warranty.

View All Injectors Replacement Cost Guide Call 020 3355 6581