R9M402 Injector Problems – Symptoms, Causes & Fixes

Engine: R9M402 1 compatible injectors From £120

Common Injector Failures on the R9M402

The R9M402 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 R9M402 include models from Renault, Vauxhall. 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 R9M402 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

R9M402 Injector Replacement Cost

Parts (per injector)

£120–£120

Labour

£150–£400

Total (per injector)

£270–£520

Full replacement cost guide

Compatible Injectors for the R9M4021 found

0445110414Bosch

£120.00

Related Cross Reference Numbers for R9M402

0986435211 166105302R 95518000

Related Engine Codes

R9M414

Frequently Asked Questions

What are common injector problems on the R9M402 engine?

The R9M402 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 R9M402 engine?

A remanufactured injector for the R9M402 engine typically costs £120–£120 per injector. Labour adds £150–£400 depending on accessibility. We found 1 compatible injectors for this engine.

Which vehicles use the R9M402 engine?

The R9M402 engine is found in vehicles from Renault, Vauxhall. Common models include Renault Fluence, Renault Grand Scenic III, Renault Megane III, Renault Scenic III, Renault Trafic III.

How do I test the injectors on a R9M402 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

Explore Related Content

Diagnostic Guides

Related Vehicles

Need a Replacement R9M402 Injector?

We stock 1 tested replacement injectors for the R9M402 engine. All remanufactured, bench-tested, and supplied with a 12-month warranty.

View All Injectors Replacement Cost Guide Call 020 3355 6581

Diesel Injector Knowledge Centre

Remanufactured, Reconditioned or Refurbished Diesel Injectors — What We Supply

Whether you searched for remanufactured, reconditioned or refurbished diesel injectors, the product here is the same: a professionally remanufactured injector, not a cleaned-up used part. Each unit is dismantled, inspected against the manufacturer's test plan, worn components such as nozzles and control valves are replaced where the bench results call for it, then it is calibrated, tested and supplied ready to fit with its coding data. We remanufacture in-house in the UK and deliver nationwide.

Is a reconditioned injector the same as a remanufactured one?

In UK trade language the terms are used interchangeably. What matters is the process: our injectors are fully remanufactured — dismantled, worn parts replaced where required, recalibrated on the test bench and covered by a 12-month warranty — rather than simply cleaned and resold.