Renault Clio
Renault's most-produced diesel with over 20 years of production history — with exemplary maintenance (oil every 10,000 km, fuel filter every 8,000–10,000 km) over 300,000 km is achievable. Biggest weakness: connecting rod bearings spin from around 100,000–150,000 km, especially with extended oil change intervals. Common-rail injectors (Delphi) and EGR valve are further service items.
Rattling without reward
75 hp dCi in the Clio — frugal, but noisy and sluggish. No fun.
Engine Weaknesses 5
The K9K connecting rod bearings are design-sensitive. With overly long oil change intervals or incorrect oil the bearing shells spin from around 100,000–150,000 km, resulting in total engine failure.
Symptoms: Knocking engine noise, oil pressure warning light, sudden engine stop
The Delphi high-pressure pump shows weaknesses from around 80,000 km. Metal wear from the pump contaminates the fuel circuit and damages the injectors and common rail — with consequential damage included.
Symptoms: Starting difficulties, sudden engine stall, 'injection fault' message
K9K injectors are very sensitive to fuel quality. Poor-quality diesel or clogged fuel filters lead to rough running, increased consumption and expensive injector replacement.
Symptoms: Engine hesitation, power loss, increased fuel consumption, black smoke
With frequent short-trip operation the DPF cannot complete its regeneration cycle and becomes blocked. Forced regeneration or replacement required — particularly problematic in city vehicles with the 90 hp unit.
Symptoms: DPF warning light, power reduction (limp mode), increased consumption
The EGR valve on the K9K fouls with soot deposits, especially with frequent short-trip use. Annual cleaning is necessary to prevent power loss and increased fuel consumption.
Symptoms: Power loss, rough idle, increased fuel consumption
Vehicle Weaknesses 7
The 1.2 TCe 120 shows significantly increased oil consumption from around 80,000 km (up to 1 L/2,000 km). Oil starvation promotes timing chain stretch. The engine block must be completely removed for chain replacement — costs up to 2,500 €.
Bolts on the front subframe can work loose over time and lead to driving instability. A recall affected several production years. MOT inspections often reveal this.
Despite improvements over the predecessor, suspension components and springs are flagged above-average at MOT on the Clio IV. Sway bar links wear regularly.
Defective brake hoses and loose brake caliper pistons were documented during long-term testing. Brakes can be heavily worn as early as 50,000 km.
Rattling seats, paint defects at delivery and sharp plastic edges were documented. Navigation system and infotainment occasionally fail.
Lighting components continue to fail above-average on the Clio IV. TÜV reports confirm headlights and rear lights as weak points across the entire Clio range.
The R-Link navigation system responds slowly, freezes or shows display errors. GPS reception occasionally drops out. Software updates often help but not permanently.
Reports & Tests
The fourth generation fails predominantly due to suspension defects. Incorrectly aimed dipped headlights from the third MOT onwards are a primary fault, alongside brake lines and brake disc wear.
