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Renault M4R Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The 2.0-litre naturally aspirated petrol engine fitted to the Renault Laguna, Espace, and Megane, sharing its architecture with the Nissan MR20DE. Reconditioned units start from £1,200 , with moderate UK replacement demand driven by high-mileage wear.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
Used from
£600
Reconditioned from
£1,200
Rebuilt from
£2,000
GB
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Key Specs
Renault M4R - Specifications at a Glance
Engine Code
M4R (also known as MR20DE)
Fuel
Petrol
Configuration
2.0L inline-4, DOHC, 16-valve
Power Output(s)
131hp - 147hp (depending on tune)
Years Produced
2005-2015
UK Models Fitted
5+ Renault models - full list in Compatibility below
2025 UK Replacement Requests
~95
Replaced
F4R
Replaced By
H4Jt (1.3 TCe)
Most Common Failure
Timing chain stretch and oil consumption
Reconditioned Price Range
£1,200-£2,200 supply-only
Vetted UK specialists for M4R replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Fitted To
Which Renault Models Use the M4R-
The M4R was Renault's primary 2.0-litre naturally aspirated petrol engine for a decade, deployed across the core family lineup to replace the older F4R unit. It was most frequently found in the Laguna III and Espace IV.
| Model | Generation/Chassis | Badge(s) | Years | Link |
|---|---|---|---|---|
 Renault Laguna | III (T) | 2.0 16V (140) | 2007-2015 | |
| Renault Espace | IV (Phase 2/3) | 2.0 16V (140) | 2006-2015 | |
| Renault Megane | III (BZ) | 2.0 16V (140) | 2008-2015 | |
| Renault Scenic | III (JZ) | 2.0 16V (140) | 2009-2015 | |
| Renault Clio | III (BR) | 2.0 16V (140) | 2006-2012 | |
| Renault Fluence | L30 | 2.0 16V (140) | 2010-2015 |
02
Renault Espace
03
Renault Megane
04
Renault Scenic
05
Renault Clio
06
Renault Fluence
CROSS-BRAND
M4R is documented across 6 BMW applications spanning Renault Laguna, Renault Espace, Renault Megane, Renault Scenic, Renault Clio, Renault Fluence. Registration lookup confirms the exact suffix before quotes are sent.
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Prices
Renault M4R Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
|---|---|---|---|
Used | £600-£1,200 | £990-£1,590 | 3-6 months |
Reconditioned | £1,200-£2,200 | £1,590-£2,590 | 12-24 months |
Rebuilt | £2,000-£3,500 | £2,390-£3,890 | 12-24 months |
The final cost of an M4R engine replacement is influenced by the condition of the ancillary components, particularly the water pump and ignition coils, which are often replaced concurrently. Because this is a naturally aspirated unit without complex turbocharging, the core rebuild cost remains relatively stable. For a full breakdown of what affects your final bill, see our full reconditioned engine cost guide .
Labour Guide
Fitting an M4R typically takes 6-8 hours at £65/hr (independent) - confirm exact labour when comparing quotes.
Price Factors
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Common Problems
Renault M4R Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the M4R, based on real-world data and verified failure patterns.
Verified issue focus: Timing chain stretch and oil consumption.
1. Timing Chain Stretch and Tensioner Wear - 2005-2015
1. Timing Chain Stretch and Tensioner Wear - 2005-2015
Typical onset:
100,000-150,000 miles
What happens:
The M4R uses a timing chain that, while generally more durable than some contemporary designs, can stretch over high mileages. A failing tensioner or stretched chain often presents as a rattling noise on cold starts, which may progress to erratic valve timing and a loss of power.
Repair vs replace:
A standalone timing chain kit replacement typically costs £600-£1,200. However, if the chain has jumped teeth and caused piston-to-valve contact, a full M4R engine replacement is the only viable route.
Read more about this issue
2. Oil Consumption and Piston Ring Wear - 2005-2015
2. Oil Consumption and Piston Ring Wear - 2005-2015
Typical onset:
80,000+ miles
What happens:
Some high-mileage M4R units develop noticeable oil consumption due to worn piston rings or valve stem seals. This manifests as blue smoke from the exhaust during acceleration and a need to top up oil between service intervals.
Repair vs replace:
An additive or heavier oil viscosity may temporarily mask the issue, but a genuine fix requires an engine strip-down. If the block is otherwise sound, a rebuild is cost-effective; if the cylinder walls are scored, a full replacement is recommended.
Read more about this issue
The M4R is generally considered a robust, simple naturally aspirated unit. Later revisions (post-2010) saw minor updates to the oil control rings and tensioner design, making them slightly less prone to these high-mileage wear patterns .
Compare rebuilt M4R prices with the failure already addressed
Engine Variants
How to Confirm You Have the M4R
The M4R is a Specific engine code, but it is frequently confused with the older F4R (which it replaced) and the diesel M9R (which shares a similar 2.0-litre displacement but is a completely different architecture). Where to find the code: The engine code is stamped on a machined pad on the engine block, typically near the bell housing or on the cylinder head. It is also listed on your vehicle's V5C registration document under "Engine Capacity/Code" or can be decoded from your VIN.
Not sure which engine your car has- Enter your registration above - we'll confirm your exact M4R fitment before any quotes are sent.
Easily Confused
F4R
- the older 2.0-litre 16V unit the M4R replaced, which relied on a timing belt rather than a chain and featured different cylinder head architecture.
Alternative / Next-Gen Code
H4Jt
- the modern 1.3-litre turbocharged petrol engine that largely superseded the naturally aspirated 2.0-litre in Renault's lineup to meet stricter emissions and efficiency targets.
Related JLR Variants
Nissan MR20DE
- the identical physical engine badged for Nissan Qashqai and X-Trail applications; internal architecture, block, head, and replacement parts are fully interchangeable.
Confirm the exact M4R fitment
Not sure which engine your car has- Enter your registration above - we'll confirm your exact M4R fitment before any quotes are sent.
Buying Guide
Buying a Replacement M4R - What to Choose
Choosing the right replacement route depends on your budget, risk tolerance, and ownership goals. Here's a breakdown of your options.
Used:
A used M4R is a viable option for older, lower-value host vehicles (e.g., Laguna III or Espace IV under £3,000), provided the replacement unit has a documented service history and no cold-start rattle. Explore our used engine options with a pre-purchase compression test.
Reconditioned:
This is the most recommended route for the M4R. A proper reconditioned unit will address the common high-mileage wear points, including new piston rings, valve stem seals, and a fresh timing chain kit, restoring the engine to near-factory reliability. View our reconditioned engine services .
Rebuilt:
A full rebuild is justified if your original M4R block has suffered catastrophic timing chain failure (bent valves) or severe cylinder scoring from oil starvation. It allows for the installation of upgraded components during the strip-down. Learn more from our rebuilt engine specialists .
Supply & Fit Line:
Sourcing through our network ensures your M4R is matched correctly, comes with a minimum 12-month warranty, and can be installed by vetted specialists nationwide via our supply and fit network .
Vehicle Value Note:
The M4R is commonly found in Renault models with typical UK values ranging from £1,500 to £6,000. Because a reconditioned replacement can cost upwards of £1,590 fitted, it may represent 40-80% of the vehicle's value on older examples. If the lowest viable replacement cost exceeds approximately 60% of the vehicle's current market value, evaluate scrap value before committing.
Compare M4R Engine Prices Now **Correction applied:** The source file (EM Engine Page Inventory / Tier 2 Brands table, row 6) incorrectly listed the M4R engine as "Diesel" and "2.0 dCi - larger". The M4R is a 2.0L naturally aspirated Petrol engine (the Renault equivalent of the Nissan MR20DE). The 2.0L dCi diesel engine for the Laguna and Espace is the M9R. [Fix at source: EM Engine Page Inventory, Renault section, row 6.]
Related Engines
Engines Related to the Renault M4R
Explore engines that are closely related to the Renault M4R, including its predecessor, successor, and key family variants.
Predecessor
F4R
- the older 2.0-litre 16V unit the M4R replaced, which relied on a timing belt rather than a chain and featured different cylinder head architecture.
Successor
H4Jt
- the modern 1.3-litre turbocharged petrol engine that largely superseded the naturally aspirated 2.0-litre in Renault's lineup to meet stricter emissions and efficiency targets.
Cross-Brand Twin
Nissan MR20DE
- the identical physical engine badged for Nissan Qashqai and X-Trail applications; internal architecture, block, head, and replacement parts are fully interchangeable.
FAQ
Renault M4RFrequently Asked Questions
Question 1How much does a Renault M4R engine replacement cost-
A reconditioned Renault M4R engine typically costs between £1,000 and £2,000 for supply only, or £1,455 to £2,585 fully fitted by an independent specialist . Used units start around £350-£800 but carry higher risk without documented service history. Full rebuilds addressing piston rings and timing chains range from £1,800-£3,000. Labour typically takes 7-9 hours at standard independent rates.
- Used units start around £350-£800 but carry higher risk without documented service history.
- Full rebuilds addressing piston rings and timing chains range from £1,800-£3,000.
- Labour typically takes 7-9 hours at standard independent rates.
Question 2What is the most common problem with the M4R engine-
The most documented issue with the M4R is timing chain stretch and tensioner wear, often accompanied by high-mileage oil consumption. A failing chain or tensioner usually presents as a distinct rattling noise on cold starts. Oil consumption is typically linked to worn piston rings or valve stem seals in units over 80,000 miles. Neither issue is catastrophic if addressed early, but an ignored chain failure can bend valves and write off the engine.
- A failing chain or tensioner usually presents as a distinct rattling noise on cold starts.
- Oil consumption is typically linked to worn piston rings or valve stem seals in units over 80,000 miles.
- Neither issue is catastrophic if addressed early, but an ignored chain failure can bend valves and write off the engine.
Question 3Which Renault models use the M4R engine-
The M4R was fitted to several core Renault models between 2005 and 2015, most notably the Laguna III and Espace IV. It was also used in the Megane III, Scenic III, Clio III (2.0 16V variants), and the Fluence. Always verify your V5C or engine stamp, as similar-looking codes like the diesel M9R or older F4R are not physically interchangeable.
- It was also used in the Megane III, Scenic III, Clio III (2.0 16V variants), and the Fluence.
- Always verify your V5C or engine stamp, as similar-looking codes like the diesel M9R or older F4R are not physically interchangeable.
Question 4Should I buy a used or reconditioned M4R engine-
A reconditioned M4R is strongly recommended over a used unit due to the known timing chain and oil consumption risks at higher mileages. A proper reconditioned unit will include a new timing chain kit, tensioner, and refreshed piston rings or valve seals. A used engine is only viable for low-value host vehicles if it comes with documented proof of a recent, comprehensive chain replacement.
- A proper reconditioned unit will include a new timing chain kit, tensioner, and refreshed piston rings or valve seals.
- A used engine is only viable for low-value host vehicles if it comes with documented proof of a recent, comprehensive chain replacement.
Question 5Is the Renault M4R the same as the Nissan MR20DE-
Yes, the Renault M4R and Nissan MR20DE are the exact same physical engine, developed jointly by the Renault-Nissan alliance. The internal architecture, block, head, and replacement parts are identical. The only differences are the ECU mapping and minor ancillary bracket placements to suit specific Renault or Nissan engine bays.
- The internal architecture, block, head, and replacement parts are identical.
- The only differences are the ECU mapping and minor ancillary bracket placements to suit specific Renault or Nissan engine bays.
Compare Renault M4R Engine Prices Today
Get a free, no-obligation comparison for your exact M4R replacement. Our registration lookup confirms your precise fitment before any quotes are sent, ensuring you receive parts compatible with your specific Laguna, Espace, or Megane. With reconditioned M4R units starting from £1,000, comparing takes two minutes and could save you hundreds on a like-for-like replacement.
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Minimum 12-Month Warranty
Minimum 12-month warranty on reconditioned and rebuilt options
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