RHG Injector Problems – Symptoms, Causes & Fixes

Engine: RHG 1 compatible injectors From £90

Common Injector Failures on the RHG

The RHG 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 Siemens VDO / Continental.

Vehicles fitted with the RHG include models from Fiat. 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 RHG 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

RHG Injector Replacement Cost

Parts (per injector)

£90–£90

Labour

£150–£400

Total (per injector)

£240–£490

Full replacement cost guide

Compatible Injectors for the RHG1 found

5WS40156ZSiemens VDO / Continental

£90.00

Related Cross Reference Numbers for RHG

562001510 5WS40156 5WS40156-Z AAA9858640010

Related Engine Codes

RHK RHR

Frequently Asked Questions

What are common injector problems on the RHG engine?

The RHG 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 RHG engine?

A remanufactured injector for the RHG engine typically costs £90–£90 per injector. Labour adds £150–£400 depending on accessibility. We found 1 compatible injectors for this engine.

Which vehicles use the RHG engine?

The RHG engine is found in vehicles from Fiat. Common models include Fiat Scudo.

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

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

View All Injectors Replacement Cost Guide Call 020 3355 6581