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1.4 and 1.6 8v vs 1.4 and 1.6 16v: which engine is more reliable?

According to our risk index, the 1.4 and 1.6 16v carries less risk than the 1.4 and 1.6 8v: 45/100 versus 48/100 (both moderate risk). The 1.4 and 1.6 8v has 3 documented serious faults, the main one being «LPG tank corrosion»; the 1.4 and 1.6 16v has 1 documented serious fault, the main one being «Timing belt breakage or premature failure».

Risk index

1.4 and 1.6 8v

48

Moderate risk · 3 serious faults

Risk index

1.4 and 1.6 16v

45

Moderate risk · 1 serious fault

Lower risk

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

14 sourcesHow we work

Is the 1.4 and 1.6 8v reliable?

The K7J (1.4) and K7M (1.6) are the original 8-valve, single-camshaft versions of Renault's «K» family: simple naturally aspirated engines that are, on the whole, reliable. None of the sources consulted documents oil consumption or faults that destroy the block. The most frequently cited weak points are the crankshaft sensor, the head gasket and the ignition coils; on Dacia's LPG versions, corrosion of the gas tank is added to the list.[1][2][3]

See the 5 of the 1.4 and 1.6 8v faults

Is the 1.4 and 1.6 16v reliable?

The K4J (1.4) and K4M (1.6), both naturally aspirated 16-valve units, are simple and generally reliable petrol engines: no source consulted documents oil consumption or faults that destroy the block. Their most-cited weak point is the ignition coils, followed by the crankshaft sensor and, on versions with a variable valve timing unit, its pulley; a neglected belt can cause serious damage, as one case in the Renault Laguna II documents.[4][5][6][7]

See the 6 of the 1.4 and 1.6 16v faults

Side-by-side comparison

Comparison of 1.4 and 1.6 8v and 1.4 and 1.6 16v
1.4 and 1.6 8v1.4 and 1.6 16v
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement——
TimingTiming belt (dry)Timing belt (dry)
Power75–90 hp75–135 hp
Productionsince 1995[8][9][10]since 1998[8][9][10]
Reliability
Risk index (what is it?)48Moderate risk45Moderate risk
Documented faults56
Of high or critical severity31
Worst severityHigh severityHigh severity
Main faults
  1. High severity: LPG tank corrosion
  2. High severity: Timing belt breakage or failure
  3. High severity: Head gasket (and, in some cases, cylinder head)
  1. Medium severity: Ignition coil failure
  2. High severity: Timing belt breakage or premature failure
  3. Medium severity: Crankshaft position sensor failure
Most expensive documented repairNo reliable dataNo reliable data
Which versions to buy
BuyRecommended versionsNone
  • 1.6 16V 105-110 hp Dacia, without variable valve timing unit (K4M, 2004-2020)[2][7]
With cautionVersions to be cautious about
  • 1.4 8V 75 hp (K7J, 1995-2012)[1][2][3][11]
  • 1.6 8V 90 hp (K7M, 1995-2012)[1][2]
  • 1.4 8V 75 hp LPG (K7J 714, Dacia, 2008-2012)[3]
  • 1.4 16V 75-100 hp (K4J, 1999-2012)[1][12]
  • 1.6 16V 110-135 hp with variable valve timing unit (K4M, 1998-2020)[6][13][14]
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

1.4 and 1.6 8v

1.4 and 1.6 16v

See the 13 models with the 1.4 and 1.6 16v

Other comparisons

With the 1.4 and 1.6 8v

With the 1.4 and 1.6 16v

Compare other engines

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Sources

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

  1. Fiabilité et pannes de la Renault Clio 2Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  2. Fiabilité et pannes du Dacia Logan 1Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  3. Fiabilité et pannes du Dacia Sandero 1Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  4. Fiabilité et pannes de la Renault Mégane 1Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  5. Fiabilité et pannes du Renault Scénic 1Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  6. Fiabilité et pannes de la Renault Laguna 2Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  7. Fiabilité et pannes du Dacia Duster 1Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  8. Renault K-Type engineWikipedia (inglés) · Other source · consulted 27 September 2026
  9. Moteur K RenaultWikipedia (francés) · Other source · consulted 27 September 2026 · in French
  10. Anexo:Motores de RenaultWikipedia (español) · Other source · consulted 27 September 2026 · in Spanish
  11. Fiabilité et pannes du Renault Kangoo 1Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  12. Fiabilité et pannes de la Renault Clio 3Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  13. Fiabilité et pannes de la Renault Mégane 2Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  14. Fiabilité et pannes du Renault Scénic 2Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French