Alfa Romeo 166 2.4 JTD Diesel Engines
from £885 to £1,950
Rebuilt units from £885 · Common codes: 939A2.000, AR32501, AR32801
Alfa Romeo ENGINE MARKETPLACE
Alfa Romeo 166 Engine Replacement - Compare Quotes from UK Specialists
Get quotes from trusted UK Alfa Romeo 166 engine specialists. Compare reconditioned and rebuilt prices for AR34102, AR16105, 839A6000 - 2.0 V6 Turbo to 3.0 V6 covered. Get specialist quotes for your 166.
Supply & Fit Available
12-Month Warranty
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Alfa Romeo 166 Busso V6 Petrol Engines
from £1,200 to £3,500
Rebuilt units from £1,200 · Common codes: AR36101, AR34201, 936A000
Alfa Romeo 166 2.0 Twin Spark Engines
from £750 to £1,800
Rebuilt units from £750 · Common codes: AR32310, AR32302
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Supply & fit available - parts and labour from vetted specialistsInstant engine replacement quote - 100% free, no obligationEngine replacement near me - UK-wide specialist networkCompare reconditioned, rebuilt & used engine pricesSupply & fit available - parts and labour from vetted specialistsHow It Works
3 Simple Steps3 Simple Stepsto Finding the Best Alfa Romeo 166 Replacement Engineto Finding the Best Alfa Romeo 166 Replacement Engine
12-Month Warranty
Supply & Fit Available
Nationwide Delivery
Trusted UK Suppliers
Most replacements completed within 3-5 days.
Live UK Engine Market Data
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↻ Last updated: 4 Aug 26, 9:26
Customer Reviews
Trusted by Alfa Romeo 166 Owners Across the UK
Rated 4.8 out of 5 by 1,081 verified customers who sourced reconditioned and used Alfa Romeo 166 engines through EngineMarket.
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Variants We Cover
Alfa Romeo 166 Engine ReplacementAll Variants Covered
Alfa Romeo 166 2.4 JTD 10v
AR32501/AR32801 2.4L Diesel
Rebuilt Engines: £885-£1,650
Alfa Romeo 166 2.4 JTD 20v
939A2.000 2.4L Diesel
Rebuilt Engines: £1,100-£1,950
Alfa Romeo 166 2.4 JTD Lusso
939A2.000 2.4L Diesel
Rebuilt Engines: £1,200-£1,950
Alfa Romeo 166 2.0 Twin Spark
AR32310 2.0L Petrol
Rebuilt Engines: £750-£1,800
Alfa Romeo 166 2.5 V6 Busso
AR34201/AR36201 2.5L Petrol
Rebuilt Engines: £1,100-£2,400
Alfa Romeo 166 3.0 V6 Busso
AR36101 3.0L Petrol
Rebuilt Engines: £1,200-£3,200
Alfa Romeo 166 3.2 V6 Busso
936A000 3.2L Petrol
Rebuilt Engines: £1,800-£3,500
Alfa Romeo 166 2.0 V6 Turbo
AR34102 2.0L Petrol
Rebuilt Engines: £1,400-£2,800
Alfa Romeo 166 3.0 V6 Sportronic
AR36101 3.0L Petrol
Rebuilt Engines: £1,300-£3,200
Alfa Romeo 166 2.5 V6 Super
AR34201 2.5L Petrol
Rebuilt Engines: £1,100-£2,300
Alfa Romeo 166 2.4 JTD Super
AR32801 2.4L Diesel
Rebuilt Engines: £950-£1,750
Alfa Romeo 166 3.0 V6 Lusso
AR36101 3.0L Petrol
Rebuilt Engines: £1,250-£3,300
Not sure which variant your Alfa Romeo 166 is- Enter your registration number above - we'll identify the exact sub-model, engine code and compatible replacement options instantly.
166
Engine Codes
Alfa Romeo 166 Engine CodesFull Technical Specifications & Replacement Guide
Every engine code fitted to the Alfa Romeo 166 across all generations, with technical specs, compatible variants and trims, known failure points, and average rebuilt prices from UK specialists. Select any engine code to compare quotes.
Diesel Engines
Extracted from detailed diesel engine families across Alfa Romeo 166 variants.
AR32501 - 2.4L Diesel
Main replacement triggers are timing chain wear, EGR / cooling faults and turbo-control issues.
Compatible variants
2.4 JTD2.4 JTD Standard2.4 JTD Super
Avg. rebuilt price
£885 - £1,650
Supply only
Technical specifications
- Fuel type
- Diesel
- Engine size
- 2.4L
- Power output
- 136-140 hp
- Years fitted
- 1999-2007
Common failures
- ●Main replacement triggers are timing chain wear, EGR / cooling faults and turbo-control issues.
- ●Confirm exact engine code and fitment before ordering.
- ●Ask for warranty and supply & fit terms.
Not sure which engine code?
Can't find your engine code- Enter your registration number above - we'll instantly identify the exact unit, its technical specifications, and live replacement prices from UK Alfa Romeo 166 engine specialists. Every rebuilt engine comes with a minimum 12-month unlimited mileage warranty.
166
Common Problems
Alfa Romeo 166 Engine Problems - What It Costs to Fix & When Replacement Makes Sense
The Alfa Romeo 166's legendary Busso V6 and refined JTD diesels are robust when maintained, but timing belt neglect, injector wear and variator failure drive most UK replacement enquiries. Every rebuilt engine supplied through EngineMarket includes upgraded internal components designed to address the original failure point - plus a minimum 12-month...
Timing Belt Failure on Busso V6 Engines - Why Alfa Romeo 166 V6 Units Fail
Timing Belt Failure on Busso V6 Engines
Most affected vehicles
Alfa Romeo 166 2.5 V63.0 V6
Alfa Romeo 166 2.5 V6, 3.0 V6, 3.2 V6 (1999-2007, AR34201/AR36101/936A000)
Failure mileage range
60,000-90,000 miles if service intervals missed
Typical failure window
Root cause
Interference engine design means belt snap or tensioner failure causes valves to collide with pistons, destroying the cylinder head and often the block.
Repair options & estimated costs (UK ranges)
| Repair tier | Dealer price | Specialist price | What it involves | Longevity / suitability |
|---|---|---|---|---|
| Minor - Preventative Belt Replacement | £650 - £950 | £450 - £750 | Full timing belt, tensioners, water pump replacement before failure | Restores 60k mile service interval; only viable before catastrophic damage |
| Full Replacement - Rebuilt Busso V6 | £2,800 - £5,500 | £1,200 - £3,500 | Supply & fit rebuilt engine with upgraded components, bench tested, 12-month warranty | Restores like-new reliability; only option after belt-snap damage |
Our recommendation
On a 166 worth £1,500-£4,000, preventative belt replacement at 60k miles is essential. If the belt has snapped, replacement with a rebuilt Busso unit is the only viable option - repair costs exceed vehicle value.
Compare rebuilt Busso V6 engine prices for your Alfa Romeo 166Replacement Engine Options
Alfa Romeo 166 Engine TypesOptions, Costs & What to Expect
Every Alfa Romeo 166 engine type is available through our UK network with typical price ranges based on variant, engine code and budget.
Alfa Romeo 166 Reconditioned Engines (Recon)£885 - £2,400((supply only))
Alfa Romeo 166 Rebuilt Engines£1,100 - £3,500((supply only))
Alfa Romeo 166 Used Engines£550 - £1,650((supply only))
Alfa Romeo 166 Remanufactured Engines£1,800 - £4,200((supply only))
Alfa Romeo 166 Refurbished Engines£750 - £2,100((supply only))
Compare Alfa Romeo 166 engine prices with vetted UK suppliers
All engine types include a minimum 12-month unlimited mileage warranty when sourced through EngineMarket. Prices are typical UK market ranges based on historical quote data from our network and depend on exact engine code, variant, mileage and supplier. Use our free comparison tool above - enter your registration to get tailored quotes for your specific Alfa Romeo 166 within hours.
Engine Sizes
Alfa Romeo 166 Engines by SizeFind the Right Displacement for Your Variant
Every displacement fitted to the Alfa Romeo 166 is listed below with compatible engine codes, production years and common failure notes to help you identify the right replacement.
The 2.4-litre JTD diesel powered most 166s sold in the UK, offered in 10-valve form from launch and upgraded to 20-valve MultiJet for the 2004 facelift, delivering strong torque and refined cruising for this executive saloon.
⚙
Engine Code(s)
AR32501, AR32801, 939A2.000
▣
Compatible Models (UK)
2.4 JTD (1999-2004), 2.4 JTD M-Jet (2004-2007), Lusso/Super/Sportronic trims
ϟ
Power output
Verified by registration
△
Common Failure Points
Injector wear on high-mileage units, swirl flap actuator failure on pre-2004 engines, EGR clogging causing limp mode
Production Years: Check by registration
Get quotes for Alfa Romeo 166 2.4L diesel enginesFuel Type
Alfa Romeo 166 Engines by Fuel Type
Choose your Alfa Romeo 166 engine by fuel type to compare realistic replacement prices, known issues, and compatible UK supply options - from the efficient 2.4 JTD diesel to the legendary 3.2 Busso V6 petrol.
Alfa Romeo 166 Diesel Engines
DieselThe 2.4-litre JTD diesel was the volume seller for the 166 in the UK, offered in 10v and later 20v MultiJet form, prized for refinement and torque but requiring careful injector and EGR maintenance.
Common Alfa Romeo 166 Diesel Engine Families
- •939A2.000 - 20v MultiJet facelift engine (2004-2007), 175-185hp with superior torque
- •AR32801 - Revised 10v JTD (2001-2004), 150hp with improved mapping over early units
- •AR32501 - Early 10v JTD (1999-2004), 136-140hp entry diesel with common-rail refinement
Found In
- •Pre-facelift 166 (1999-2003) - AR32501/AR32801 10v JTD
- •Facelift 166 (2004-2007) - 939A2.000 20v MultiJet JTD
Known For
- •Strong motorway fuel economy and refined cruising character
- •Injector wear on high-mileage units causing rough running and hard starting
- •Swirl flap actuator failure on pre-2004 10v engines entering inlet manifold
Typical Diesel Models
- •2.4 JTD Standard
- •2.4 JTD Lusso
- •2.4 JTD Super
1 of 2
Alfa Romeo 166 Diesel Engines
DieselThe 2.4-litre JTD diesel was the volume seller for the 166 in the UK, offered in 10v and later 20v MultiJet form, prized for refinement and torque but requiring careful injector and EGR maintenance.
Common Alfa Romeo 166 Diesel Engine Families
- •939A2.000 - 20v MultiJet facelift engine (2004-2007), 175-185hp with superior torque
- •AR32801 - Revised 10v JTD (2001-2004), 150hp with improved mapping over early units
- •AR32501 - Early 10v JTD (1999-2004), 136-140hp entry diesel with common-rail refinement
Found In
- •Pre-facelift 166 (1999-2003) - AR32501/AR32801 10v JTD
- •Facelift 166 (2004-2007) - 939A2.000 20v MultiJet JTD
Known For
- •Strong motorway fuel economy and refined cruising character
- •Injector wear on high-mileage units causing rough running and hard starting
- •Swirl flap actuator failure on pre-2004 10v engines entering inlet manifold
Typical Diesel Models
- •2.4 JTD Standard
- •2.4 JTD Lusso
- •2.4 JTD Super
Alfa Romeo 166 Petrol Engines
PetrolPetrol 166s feature Alfa's legendary Busso V6 engines in 2.5, 3.0 and 3.2-litre forms plus the entry 2.0 Twin Spark, all interference engines requiring strict timing belt maintenance to avoid catastrophic failure.
Common Alfa Romeo 166 Petrol Engine Families
- •AR36101 - 3.0L Busso V6 CF3 (2001-2007), 220hp the enthusiast favourite with iconic sound
- •936A000 - 3.2L Busso V6 (2004-2007), 240hp flagship unit for facelift Lusso/Sportronic
- •AR32310 - 2.0L Twin Spark (1999-2007), 150hp entry petrol with variator rattle common
Found In
- •Early 166 (1999-2001) - AR34301 3.0 V6 CF2, AR34201 2.5 V6 CF2, AR32310 2.0 TS
- •Mid-life 166 (2001-2003) - AR36101 3.0 V6 CF3, AR36201 2.5 V6 CF3, AR32310 2.0 TS
- •Facelift 166 (2004-2007) - 936A000 3.2 V6, AR36101 3.0 V6, AR32310 2.0 TS
Known For
- •The legendary Busso V6 sound and smooth power delivery enthusiasts seek
- •Timing belt failure risk on all petrol units - interference engines require strict 60k mile changes
- •Variator rattle on 2.0 TS causing diesel-like startup noise requiring replacement
Typical Petrol Models
- •2.0 TS Standard
- •2.0 TS Super
- •2.5 V6 Lusso
Not sure which fuel type your Alfa Romeo 166 has- Enter your registration number above to instantly identify your engine code, fuel system and compatible replacement options - all backed by a minimum 12-month unlimited mileage warranty from UK Alfa Romeo 166 specialists.
Engine YearsGet quotes for 1999-2000 Alfa Romeo 166 replacement engines →
Alfa Romeo 166 Engines by YearWhat Was Fitted & WhenAlfa Romeo 166 Engines by Year - What Was Fitted & When
This section covers all major engine changes across the Alfa Romeo 166's 1999-2007 UK production timeline, organised so owners can quickly identify their engine and compare rebuilt prices from specialists.
⚙Key Changes
- ✓UK launch with 2.0 TS, 2.5 V6, 3.0 V6 petrol and 2.4 JTD 10v diesel options
- ✓Introduction of the legendary Busso V6 architecture to the 166 range
- ✓Common-rail JTD diesel technology debut for Alfa's executive saloon
▣Main Engines
AR32302- 2.0L Twin Spark petrol (155hp) (2.0 TS variants)
AR34201- 2.5L Busso V6 CF2 petrol (190hp) (2.5 V6 variants)
AR34301- 3.0L Busso V6 CF2 petrol (226hp) (3.0 V6 variants)
AR32501- 2.4L JTD 10v diesel (136hp) (2.4 JTD variants)
▰Popular Models
- •Alfa Romeo 166 2.0 TS
- •Alfa Romeo 166 2.5 V6
- •Alfa Romeo 166 3.0 V6
- •Alfa Romeo 166 2.4 JTD
🔧Known For
- ✓Launch-spec engines with CF2 emissions equipment and early ECU mapping
- ✓Timing belt critical on all V6 units - interference design demands strict 60k mile changes
- ✓Early JTD injectors prone to wear on high-mileage urban-driven examples
- ✓Strong enthusiast following for the Busso V6 character and exhaust note
Engine Codes Covered:
AR32302AR34201AR34301AR32501Not sure which year your Alfa Romeo 166 was built- Enter your registration number and we'll identify the exact engine, model year, and compatible replacement options instantly - all backed by a minimum 12-month warranty from UK Alfa Romeo 166 specialists.
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