Renault 1.9 dCi (F9Q)Injectors
Failures of the Delphi direct-injection injectors on the 1.9 dCi
Why this rating?
High severity: Risk of a serious engine, turbo or gearbox failure.
Frequency common: gebrauchtwagenberater.de describes the Mégane II's Delphi injectors as a "regular" source of problems; planeterenault lists the injectors among the usual F9Q failures since 1999, common "as with all direct-injection diesels of the period".[1][2]
Symptoms
- The engine fault warning light may come on when an injector starts to fail.[2]Engine warning light: other faults that cause it · Garage soon
- An injection fault can trigger limp mode and limit power.[2]Limp mode: other faults that cause it · Garage soon
- An injector that sprays the diesel badly causes jerking or uneven running.[1]Jerking: other faults that cause it · Garage soon
Why it happens
Affected cars and years
The problem is documented for the whole F9Q engine with Delphi injection, without being limited to a particular power output or generation in the sources consulted.[1][2]
| Version | Years | Codes |
|---|---|---|
| 1.9 dCi 95-120 (F9Q, first generation, 1999-2005) | 1999–2005 | F9Q |
| 1.9 dCi 125-130 (F9Q, Energy dCi, 2005-2011) | 2005–2011 | F9Q |
| 1.9 dCi 80-101 (F9Q, vans and commercial vehicles, 1999-2007) | 1999–2007 | F9Q |
Models fitted with the affected versions
Nissan
- Nissan Primera III2003–2007
- Nissan Primastar2002–2006
Renault
- Renault Mégane I1999–2002
- Renault Mégane II2002–2009
- Renault Scénic I1999–2003
- Renault Scénic II2003–2009
- Renault Laguna I1999–2001
- Renault Laguna II2001–2007
- Renault Espace IV2002–2006
- Renault Kangoo I1999–2007
- Renault Trafic II2001–2006
Volvo
- Volvo S40 I1996–2004
- Volvo V40 I1996–2004
How much it costs to repair
Includes: Replacement or reconditioning of the affected Delphi injectors.[1]
We have not found published prices in Spain for the injectors on this engine.
Prices in Spain, including VAT. A workshop hour costs on average €38–66 at independent garages and €77–134 at dealerships in Spain, depending on the region and the brand. How we calculate costs
How to check for it before buying a used car
Parts needed
The part or kit that fixes this fault, according to the sources.
Delphi common-rail injector
Sprays the diesel into the combustion chamber; it is replaced when it fails or sprays badly.
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How to prevent it
- Use good-quality diesel and avoid habitually running the tank almost empty, so as not to strain the pump and injectors with possible impurities.
Recalls, campaigns and claims
As of 27 September 2026, we have no record of recalls, campaigns or extended manufacturer warranties for this fault. Check with an official dealer using the chassis (VIN) number: they will tell you whether the car has any outstanding campaign.
What owners say
Frequently asked questions
Why do the injectors on the 1.9 dCi fail?
gebrauchtwagenberater.de points to the Delphi injectors themselves as the source; planeterenault links it to the common-rail direct-injection technology of that era in general.[1][2]
Is it a problem exclusive to this engine?
No: planeterenault states that it affects direct-injection diesels of the period in general, not just the F9Q.[2]
How do you tell an injector is failing?
Through jerking, loss of power or the engine fault warning light being on.[2]
What can you do now?
We will put you in touch with a partner only if you authorise it in the form.
Other 1.9 dCi faults
- Critical severityFrequency: CommonLubricationSeizure and wear of the big-end bearingsOn the 95 to 120 hp versions built before 2005, the big-end bearings of the 1.9 dCi (F9Q) are fragile and can seize, which wrecks the bottom end of the engine. Renault did not acknowledge an official campaign, but it resolved some out-of-warranty cases.
- High severityFrequency: CommonTurboPremature turbocharger wearThe turbo on the 1.9 dCi can start to fail around 150,000 km, especially on the 100 to 130 hp versions built between 2000 and 2005. Renault went as far as covering up to 80% of the cost of out-of-warranty repairs, with no official campaign.
- Medium severityFrequency: CommonEmissions controlEGR valve blocked by soot build-upThe EGR valve on the older 1.9 dCi engines (105, 110 and 120 hp) clogs with soot fairly often, especially in urban use; fiches-auto.fr includes it among the diesels most affected by this problem before 2010.
- Medium severityFrequency: CommonClutchDual-mass flywheel failure on the 120 hp versionsfiches-auto.fr documents numerous cases of dual-mass flywheel failure on the 1.9 dCi 120 in the Scénic II and Laguna II, among the diesels most affected by this problem.
More faults with the injectors on other engines and cars
- High severityFrequency: Very frequentOM651Delphi piezo injector failure (220/250 CDI)Yes: 220 and 250 CDI models built between 2008 and 2011 had Delphi piezo injectors that were prone to failing and seizing in the cylinder head. Mercedes-Benz replaced them under warranty in 2009 and switched the 220 CDI to solenoid injectors from 2010-2011, but the 250 CDI kept them.Repair (garage): €3,600–€5,900
- High severityFrequency: CommonBMW N52 / N53N53 piezoelectric injector failureThe N53's piezoelectric direct injectors fail frequently and cause misfires, rough idle and limp mode; replacing them is expensive and they must be coded.
- High severityFrequency: CommonMZR-CDOil dilution from leaking injector seals and DPF regenerationsOn the 2.0 and 2.2 MZR-CD, injector seals that age badly and incomplete particulate filter regenerations on short journeys can let unburnt diesel into the sump, diluting the oil and leaving the engine with less lubrication.
- High severityFrequency: CommonOM642Wear and failure of the Bosch piezo injectorsThe OM642's Bosch piezo injectors can fail from around 150,000-200,000 km, especially with poor-quality diesel; they cannot be repaired, only replaced. Because it is a V engine, those on the rear bank are harder to reach, which pushes up labour costs.Repair: €4,500–€6,500
- High severityFrequency: Common2.2 CDI (OM646)Injector seal leak with carbonisation around the seatYes: the copper washer that seals each injector can harden and let combustion gases through, forming a black crust of carbon around it. It is a known fault on Mercedes CDI diesels of this era, with injectors described as fragile on both the OM611 and the OM646.
- High severityFrequency: Common2.2/2.5 dCiInjection pump or injector failureThe 2.2 dCi's common rail injectors fail fairly often on the X-Trail and Almera, with cases of seizing and leaks; on the Almera with the older YD22DDT, the documented fault is in the injection pump electronics, not the injectors.
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Sources
Every fact on this page links to its source. If you find an error, let us know.
- Renault Mégane II (2002 – 2009): Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
- Achat d'occasion : faut-il éviter le moteur 1.9 dCi F9Q chez Renault ?Planète Renault · Motoring press · published 24 January 2024 · consulted 27 September 2026 · in French