MCRCB Injector Problems – Symptoms, Causes & Fixes

Engine: MCRCB 1 compatible injectors From £160

Common Injector Failures on the MCRCB

The MCRCB 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 1 tested replacement injectors for this engine from Bosch.

Vehicles fitted with the MCRCB include models from Audi, Porsche, VW. 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 MCRCB 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

MCRCB Injector Replacement Cost

Parts (per injector)

£160–£160

Labour

£150–£400

Total (per injector)

£310–£560

Full replacement cost guide

Compatible Injectors for the MCRCB1 found

0445117021Bosch

£160.00

Most Common Injector Part Numbers for MCRCB Engine

0445117021Bosch

£160.001 vehicle

Related Cross Reference Numbers for MCRCB

0445117021 0445117022 0445117076 0986435413

Vehicles Using the MCRCB Engine

Related Engine Codes

CJGA CJGC CJGD CJMA CLAA CLAB

Frequently Asked Questions

What are common injector problems on the MCRCB engine?

The MCRCB 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 MCRCB engine?

A remanufactured injector for the MCRCB engine typically costs £160–£160 per injector. Labour adds £150–£400 depending on accessibility. We found 1 compatible injectors for this engine.

Which vehicles use the MCRCB engine?

The MCRCB engine is found in vehicles from Audi, Porsche, VW. Common models include Audi A4, Audi A5, Audi A6, Audi A7, Audi Q5.

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

We stock 1 tested replacement injectors for the MCRCB engine. All remanufactured, bench-tested, and supplied with a 12-month warranty.

View All Injectors Replacement Cost Guide Call 020 3355 6581