CJMA Injector Problems – Symptoms, Causes & Fixes

Engine: CJMA 61 compatible injectors From £220

Common Injector Failures on the CJMA

The CJMA 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 61 tested replacement injectors for this engine from Bosch.

Vehicles fitted with the CJMA 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 CJMA 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

CJMA Injector Replacement Cost

Parts (per injector)

£220–£220

Labour

£150–£400

Total (per injector)

£370–£620

Full replacement cost guide

Compatible Injectors for the CJMA61 found

Most Common Injector Part Numbers for CJMA Engine

Related Cross Reference Numbers for CJMA

0445116020 0445116021 0445116076 0445117022

Vehicles Using the CJMA Engine

AUDI Q7CJMA

Audi Q7CJMA

Related Engine Codes

BTR BUG CASA CASB CJGC CJGD

Frequently Asked Questions

What are common injector problems on the CJMA engine?

The CJMA 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 CJMA engine?

A remanufactured injector for the CJMA engine typically costs £220–£220 per injector. Labour adds £150–£400 depending on accessibility. We found 61 compatible injectors for this engine.

Which vehicles use the CJMA engine?

The CJMA engine is found in vehicles from AUDI, Audi. Common models include AUDI Q7, Audi Q7.

How do I test the injectors on a CJMA 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 CJMA Injector?

We stock 61 tested replacement injectors for the CJMA engine. All remanufactured, bench-tested, and supplied with a 12-month warranty.

View All Injectors Replacement Cost Guide Call 020 3355 6581