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1.0 T3 and 1.3 T4 FireFly Turbo vs 1.2 8v: which engine is more reliable?

According to our risk index, the 1.0 T3 and 1.3 T4 FireFly Turbo carries less risk than the 1.2 8v: 18/100 (low risk) versus 36/100 (moderate risk). The 1.0 T3 and 1.3 T4 FireFly Turbo has no documented serious faults; the 1.2 8v has 1 documented serious fault, the main one being «Damaged cylinder head gasket (coolant loss and overheating)».

Risk index

1.0 T3 and 1.3 T4 FireFly Turbo

18

Low risk · 0 serious faults

Lower risk

Risk index

1.2 8v

36

Moderate risk · 1 serious fault

The index (0–100) weights the severity and frequency of the three most serious documented faults. How it is calculated

17 sourcesHow we work

Is the 1.0 T3 and 1.3 T4 FireFly Turbo reliable?

The FireFly turbo 1.0 T3 and 1.3 T4 show no systemic fault in open sources; there are only isolated cases of jerking with replacement of the MultiAir block on the 1.0 and one engine failure on a 1.3. The evidence is thin and is not a guarantee of reliability.[1][2][3]

See the 2 of the 1.0 T3 and 1.3 T4 FireFly Turbo faults

Is the 1.2 8v reliable?

The 1.2 8v (D7F) is a simple naturally aspirated engine of 54 to 60 hp, with a timing belt, which Renault fitted from 1996 to the Twingo, Clio II and Kangoo. No catastrophic failures are documented; what owner reviews mention most often are the sensors, the cylinder head gasket, the coil packs and the occasional oil drip.[4][5][6]

See the 5 of the 1.2 8v faults

Side-by-side comparison

Comparison of 1.0 T3 and 1.3 T4 FireFly Turbo and 1.2 8v
1.0 T3 and 1.3 T4 FireFly Turbo1.2 8v
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement1,332 cm³1,149 cm³
TimingChainTiming belt (dry)
Power100–180 hp54–60 hp
Productionsince 2018[7]1996–2012[8][9][10][11]
Reliability
Risk index (what is it?)18Low risk36Moderate risk
Documented faults25
Of high or critical severity01
Worst severityMedium severityHigh severity
Main faults
  1. Medium severity: Oil consumption and premature turbo wear on the 1.0 T3 and 1.3 T4
  2. Medium severity: Jerking and MultiAir block failures on the 1.0 T3
  1. High severity: Damaged cylinder head gasket (coolant loss and overheating)
  2. Medium severity: Crankshaft sensor (TDC) and other engine sensor failure
  3. Medium severity: Ignition faults: coil packs, ignition harness and humidity
Most expensive documented repairNo reliable dataNo reliable data
Which versions to buy
BuyRecommended versions
  • 1.3 GSE T4 Turbo 150-180 hp (FireFly, since 2018)[1][12]
  • 1.3 GSE T4 Turbo plug-in hybrid 4xe (130-180 hp from the petrol engine, since 2021)[13][14]
None
With cautionVersions to be cautious about
  • 1.0 GSE T3 Turbo 100-120 hp (FireFly, since 2018)[1][2]
  • 1.0 T200 Turbo Flex 125-130 hp (South America, from 2021)[15][16]
  • 1.3 T270 Turbo Flex 182-185 hp (South America, from 2021)[15][16]
AvoidVersions to avoidNoneNone

Severity of each fault: green, low; amber, medium; red, high; dark red, critical. How we rate them

Cars that each one is fitted to

Other comparisons

With the 1.0 T3 and 1.3 T4 FireFly Turbo

With the 1.2 8v

Compare other engines

That is the comparison you are viewing: change one of the two engines.

Sources

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

  1. Fiabilité Jeep: témoignages de propriétairesfiches-auto.fr · Other source · consulted 29 October 2026 · in French
  2. Fiabilité Fiat: témoignages de propriétairesfiches-auto.fr · Other source · consulted 29 October 2026 · in French
  3. Broken chain in Firefly 1.0 engineFiat Forum · Owners' forum · consulted 30 October 2026
  4. Fiabilité Renault Clio 2 : pannes et avis des propriétairesFiches-auto.fr · Motoring press · consulted 2 November 2026 · in French
  5. Fiabilité Renault Twingo 1993-2006 : pannes et avis des propriétairesFiches-auto.fr · Motoring press · consulted 2 November 2026 · in French
  6. Fiabilité Renault Twingo 2 (2007-2014) : pannes et avis des propriétairesFiches-auto.fr · Motoring press · consulted 2 November 2026 · in French
  7. Fiat Global Small EngineWikipedia (inglés) · Other source · consulted 29 October 2026
  8. Moteur D (Renault)Wikipédia (francés) · Other source · consulted 2 November 2026 · in French
  9. Renault Clio IIWikipedia (alemán) · Other source · consulted 2 November 2026 · in German
  10. Renault TwingoWikipedia (alemán) · Other source · consulted 2 November 2026 · in German
  11. Renault Twingo IWikipedia (alemán) · Other source · consulted 2 November 2026 · in German
  12. Problemas Jeep CompassTotal Renting · Other source · consulted 29 October 2026 · in Spanish
  13. Jeep Renegade Problemecarwiki.de · Other source · consulted 29 October 2026 · in German
  14. Jeep Renegade 4xe plug-in hybrid reliability and safetyDriving Electric · Motoring press · consulted 29 October 2026
  15. Recall: Fiat convoca Fastback, Pulse e Toro por risco de incêndioGaragem 360 · Motoring press · published 25 November 2022 · consulted 2 November 2026 · in Portuguese
  16. Risco de incêndio: Fiat convoca recall para Pulse, Fastback e ToroMotor Show · Motoring press · published 25 November 2022 · consulted 2 November 2026 · in Portuguese
  17. Renault Twingo (ab 1993): Schwachstellen laut TÜV-AuswertungAUTO BILD · Motoring press · published February 2002 · consulted 2 November 2026 · in German