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Renault 2.3 dCi (M9T)Urgency: Garage soon

Engine fault warning light (check engine) in the 2.3 dCi (M9T) engine: causes

In the 2.3 dCi (M9T) engine, 2 documented faults may be the cause: clogged or broken EGR valve damaging the turbo and faulty injectors on the 2.3 dCi.[1][3]

What to do now

Garage soon

If it stays on steadily, you can drive gently to a garage and ask for a fault code read-out. If it flashes or you notice a loss of power, slow down and get to a garage as soon as possible.

What it means

The orange engine-shaped warning light comes on when the ECU detects a fault affecting combustion or emissions. If it flashes, it usually points to misfires that can damage the catalytic converter.

Engine warning light: causes in all cars

10 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. Source for the symptom[3]

How much it can cost

Depending on the cause, repair at an independent garage ranges from €400[1] (faulty injectors on the 2.3 dCi) to €2,300[1][2] (clogged or broken EGR valve damaging the turbo), including VAT.

Most serious fault among the possible causes: High severity

Other common causes: engine warning light

Besides the documented faults of the 2.3 dCi (M9T), these are the most common causes on any car according to the sources.

  • Faulty lambda sensor (oxygen sensor)[4][5]Common
  • Dirty or blocked EGR valve[4][6]Common
  • Deteriorated or blocked catalytic converter[4][7][8]Common
  • Spark plugs, coils or ignition leads in poor condition[4][9]Common
  • Faulty injectors[4]Possible
  • Blocked particulate filter[6]Possible

What to check first

  1. Note how the light behaves (steady or flashing; yellow, orange or red) and whether the car loses power, jerks, makes noises or gives off smoke. That decides whether you can carry on or must stop.[4][10]
  2. Check that the fuel filler cap is properly closed: a badly closed cap is one of the causes RACE cites and the easiest to rule out.[4]
  3. Have the codes read through the OBD port at a garage with a diagnostic machine: the error codes point to the part that is failing (sensor, EGR, injectors, ignition, catalytic converter).[4][8][9]
  4. Repair the cause and only then reset the light with the diagnostic machine. If you clear it without repairing, it will come back on.[4]
Complete guide: engine fault warning light (check engine)

Cars with the 2.3 dCi (M9T) engine

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

Frequently asked questions

Engine warning light in the 2.3 dCi (M9T): what could it be?

In the 2.3 dCi (M9T) engine, 2 documented faults may be the cause: clogged or broken EGR valve damaging the turbo and faulty injectors on the 2.3 dCi. Each fault has its own page with the affected years and versions, the cause and how to check for it.

Engine warning light in the 2.3 dCi (M9T): is it serious?

Urgency: garage soon. If it stays on steadily, you can drive gently to a garage and ask for a fault code read-out. If it flashes or you notice a loss of power, slow down and get to a garage as soon as possible. The most serious fault that causes it on this engine has high severity.

Engine warning light in the 2.3 dCi (M9T): how much does it cost to fix?

It depends on the cause: at an independent garage, from €400 (faulty injectors on the 2.3 dCi) to €2,300 (clogged or broken EGR valve damaging the turbo), including VAT.

Sources

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

  1. Renault Master III 2.3 dCi 130: fiabilité, pannes et coûtsCarverif · Other source · consulted 5 October 2026 · in French
  2. Fiabilité du Renault Master RT 2.3 dCi: analyse complèteCarverif · Other source · consulted 5 October 2026 · in French
  3. Fiabilité Renault Master 2.3 dCiCarverif · Other source · consulted 5 October 2026 · in French
  4. 7 razones por las que el testigo de fallo del motor se enciende en un cocheRACE · Motoring press · published 23 June 2026 · consulted 2 October 2026 · in Spanish
  5. Sonda lambda o sensor de oxígeno: síntomas y averíasRACE · Motoring press · published 31 October 2023 · consulted 2 October 2026 · in Spanish
  6. Testigo de control de los gases de escapeRACE · Motoring press · published 11 June 2026 · consulted 2 October 2026 · in Spanish
  7. Catalizador de un coche: ¿cómo funciona y qué síntomas de fallo puede dar?RACE · Motoring press · published 8 March 2022 · consulted 2 October 2026 · in Spanish
  8. Código de avería P0420 - guía paso a paso para su diagnóstico y resoluciónAutodoc Club · Technical documentation · consulted 2 October 2026 · in Spanish
  9. Código de avería P0300 - guía paso a paso para su diagnóstico y resoluciónAutodoc Club · Technical documentation · consulted 2 October 2026 · in Spanish
  10. Fallo del motor: guía completa de los símbolos y testigos amarillos en el cocheAutodoc Club · Technical documentation · published 9 September 2026 · consulted 2 October 2026 · in Spanish