Renault Scenic 1.5 dCi Engine ReplacementCompare Prices & Get Quotes

A Renault Scenic 1.5 dCi K9K engine replacement typically costs £1,200-£2,700 supply-only for a rebuilt unit, with used engines from £500 and reconditioned from £1,000. Total fitted cost adds 8-12 hours of labour at specialist rates (£55-£75/hr) or dealer rates (£100-£150/hr).

• Rebuilt supply-only: £1,200-£2,700 [ESTIMATED]
• Supply & fit specialist total: £1,700-£3,600
• Main dealer supply & fit: £2,500-£4,500

The most common signs of turbo failure in the K9K engine are loss of power, black smoke from the exhaust, a whistling or whining noise, increased fuel consumption, and in severe cases, the engine management light illuminating with underboost fault code P0299. If the turbo has failed catastrophically, you may hear a loud grinding noise and the engine may lose all power. Oil consumption and white smoke can also indicate turbo seal failure.

• Loss of power and black smoke are the classic symptoms
• Whistling or whining noise indicates bearing wear
• Catastrophic failure can send debris through the engine

This depends on your Scenic 1.5 dCi's overall condition and market value. For a well-maintained Scenic III or IV (worth £4,000-£8,000), a rebuilt engine at £1,200-£2,700 is viable, especially with the 12-month warranty. For an older Scenic II example worth under £2,000, a used engine (£500-£1,000) or targeted repairs (turbo, injectors, timing belt) may be more cost-effective.

• Vehicle worth under £2,000: consider used engine or repair
• Vehicle worth £4,000+: rebuilt engine with warranty is sensible
• Factor in overall condition - bodywork, suspension, interior wear

A Renault Scenic 1.5 dCi engine replacement typically takes 2-3 working days for a specialist workshop, including removal of the old K9K unit, fitting the replacement, and road testing. Main dealers may quote 3-5 days due to scheduling and OEM parts ordering.

• Supply-only delivery: next-day available across the UK
• Supply & fit: book a slot with your nearest specialist
• Express fitting available in some regions

The K9K 656 and K9K 837 are both 1.5 dCi 110bhp engines fitted to the Scenic III. The K9K 656 is an earlier variant, while the K9K 837 is a later Euro 5-compliant variant with revised emissions calibration and ECU mapping. Both share the same 1,461cc displacement, SOHC 8-valve architecture, and common failure points - turbocharger, injectors, DPF, and timing belt.

• K9K 656: earlier variant, 110bhp
• K9K 837: later variant, 110bhp, Euro 5 compliance
• Both require the same preventative maintenance - timing belt every 5 years/72k

Used engines are cost-effective (£500-£1,000) but come with unknown service history and no warranty beyond the supplier's standard 30-90 days - risk of the same turbo, injector, or timing belt issues reoccurring. Rebuilt engines (£1,200-£2,700) include new turbocharger, injectors, timing belt, water pump, DPF, EGR, piston rings, bearings, and a 12-month unlimited-mileage warranty, offering peace of mind for long-term ownership.

• Used: best for low-budget repairs on lower-value Scenics
• Rebuilt: best for long-term ownership (2+ years) and higher-value examples
• Always confirm what components were replaced in a rebuilt unit