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Renault 1.5 dCi (K9K)Urgency: Monitor

Abnormal vibrations or unstable idle in the 1.5 dCi engine: causes

In the 1.5 dCi engine, 2 documented faults may be the cause: premature dual-mass flywheel failure and clutch problems and injector and injector seal failures.[1][2][4]

What to do now

Monitor

If it comes with the engine warning light, ask for a fault code read-out. If not, have the mounts and the dual-mass flywheel checked.

What it means

The engine shakes at idle or sends vibrations through the steering wheel and the body. It can come from worn engine mounts, the dual-mass flywheel, injectors or misfires.

Vibrations: causes in all cars

16 sourcesHow we work

Engine faults that cause it

From most to least important. Under each fault, how the symptom shows up. Check the affected years and versions on each page.

  1. Source for the symptom[1][2]

  2. Source for the symptom[4]

How much it can cost

Depending on the cause, repair at an independent garage ranges from €700[2][3] (premature dual-mass flywheel failure and clutch problems) to €1,300[2][3] (premature dual-mass flywheel failure and clutch problems), including VAT.

Most serious fault among the possible causes: Medium severity

Other common causes: vibrations

Besides the documented faults of the 1.5 dCi, these are the most common causes on any car according to the sources.

  • Combustion fault: spark plugs, coils or cylinders not working[7][8][9][10]Common
  • Worn engine mounts[11][12]Common
  • Rough idle from sensors, air mass meter or intake[7][13][14]Common
  • Dirty or worn injectors, EGR valve or high-pressure pump (diesel)[7]Possible
  • Damaged dual-mass flywheel or worn clutch[12][15]Possible
  • Poor compression or worn cylinders[12]Uncommon

What to check first

  1. Work out when it vibrates: with the car stationary it points to the engine, and from around 100 km/h it usually points to the wheels, according to Carglass. That decides whether you continue with this guide or with the steering wheel and brakes ones.[8]
  2. Rule out what is normal: RACE explains that, if the engine is cold, it is normal for it to vibrate a little until the oil lubricates, and that the speed rises on starting before settling.[13][16]
  3. Watch the rev counter in neutral: if the needle fluctuates illogically or there is jerking on starting, RACE suspects the crankshaft or camshaft sensors.[13]
  4. Ask for a code reading with a diagnostic machine, especially if the engine warning light is on. RACE recommends diagnosing before replacing the air mass meter, and a code such as P0300 indicates a misfire.[10][14]
Complete guide: abnormal vibrations or unstable idle

Cars with the 1.5 dCi engine

Open yours to see only the faults that affect it according to its years and versions.

See the 47 cars with the 1.5 dCi engine

Frequently asked questions

Vibrations in the 1.5 dCi: what could it be?

In the 1.5 dCi engine, 2 documented faults may be the cause: premature dual-mass flywheel failure and clutch problems and injector and injector seal failures. Each fault has its own page with the affected years and versions, the cause and how to check for it.

Vibrations in the 1.5 dCi: is it serious?

Urgency: monitor. If it comes with the engine warning light, ask for a fault code read-out. If not, have the mounts and the dual-mass flywheel checked. The most serious fault that causes it on this engine has medium severity.

Vibrations in the 1.5 dCi: how much does it cost to fix?

It depends on the cause: at an independent garage, from €700 (premature dual-mass flywheel failure and clutch problems) to €1,300 (premature dual-mass flywheel failure and clutch problems), including VAT.

Sources

Every fact on this page links to its source. If you find an error, let us know.

  1. Maxi-fiche fiabilité : que vaut le Renault Scénic 3 en occasion ?Caradisiac · Motoring press · published 2 February 2016 · consulted 26 September 2026 · in French
  2. Volante bimasa, averías y precio de sustituciónDiariomotor · Motoring press · published 3 November 2020 · consulted 26 September 2026 · in Spanish
  3. Diesels : volant moteur défectueuxFiches-auto.fr · Owners' forum · published 17 October 2025 · consulted 26 September 2026 · in French
  4. Fiabilité Renault Mégane 3 : que vaut le modèle en occasion ?Caradisiac · Motoring press · published 25 November 2015 · consulted 26 September 2026 · in French
  5. Detecta así la avería en los inyectores y ahorra 1.000 €Autopista · Motoring press · published 21 March 2024 · consulted 26 September 2026 · in Spanish
  6. Problème d'injecteur : vos témoignagesFiches-auto.fr · Owners' forum · published 11 October 2025 · consulted 26 September 2026 · in French
  7. Ralentí inestable: causas, soluciones y mantenimiento claveRACE · Motoring press · published 23 September 2026 · consulted 4 October 2026 · in Spanish
  8. ¿Por qué el coche vibra al circular?Carglass · Other source · published 14 April 2025 · consulted 4 October 2026 · in Spanish
  9. Los síntomas que nos dan la pista de que una bujía puede estar en mal estadoRACE · Motoring press · published 29 March 2021 · consulted 4 October 2026 · in Spanish
  10. Código de avería P0300 - guía paso a paso para su diagnóstico y resoluciónAutodoc Club · Technical documentation · consulted 4 October 2026 · in Spanish
  11. Taco de motor: ¿cuál es su función?RACE · Motoring press · published 14 March 2024 · consulted 4 October 2026 · in Spanish
  12. ¿Vibra tu coche al acelerar? Los cinco motivos más habitualesRACC · Motoring press · published 13 June 2023 · consulted 4 October 2026 · in Spanish
  13. ¿Qué es el ralentí de un coche?RACE · Motoring press · published 15 April 2024 · consulted 4 October 2026 · in Spanish
  14. ¿Qué es el sensor MAF del coche y cómo funciona?RACE · Motoring press · published 17 September 2026 · consulted 4 October 2026 · in Spanish
  15. ¿Qué es el volante bimasa del coche y cómo influye en las vibraciones del motor?RACE · Motoring press · published 16 September 2026 · consulted 4 October 2026 · in Spanish
  16. Mi coche vibra, ¿a qué se debe?RACE · Motoring press · published 17 January 2023 · consulted 4 October 2026 · in Spanish