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.
Rebuilt units from £885
Common codes: 939A2.000, AR32501, AR32801
Rebuilt units from £1,200
Common codes: AR36101, AR34201, 936A000
Rebuilt units from £750
Common codes: AR32310
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Most replacements completed within 3-5 days.
The cards below cover the main engines fitted to the Alfa Romeo 166 in the UK, including documented failure causes, variant production years, and typical rebuilt engine costs based on current UK market data.
Production History
Known Failures
Specs
Petrol · 3.0L · 217-226hp · Naturally Aspirated
Replacement Cost
Typical UK rebuilt engine: £1,200-£3,500 (supply only)
Production History
Known Failures
Specs
Diesel · 2.4L · 175-185hp · Turbocharged
Replacement Cost
Typical UK rebuilt engine: £885-£1,950 (supply only)
Production History
Known Failures
Specs
Petrol · 2.0L · 148-155hp · Naturally Aspirated
Replacement Cost
Typical UK rebuilt engine: £750-£1,800 (supply only)
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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.
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.
Extracted from detailed diesel engine families across Alfa Romeo 166 variants.
Extracted from detailed diesel engine families across Alfa Romeo 166 variants.
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.
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...
Every rebuilt engine includes a minimum 12-month unlimited mileage warranty.
Why Alfa Romeo 166 V6 Units Fail
Production Years: 1999 - 2007
Engine: AR34201 / AR36101 / 936A000
Typical failure window
Interference engine design means belt snap or tensioner failure causes valves to collide with pistons, destroying the cylinder head and often the block.
| Repair Tier | Dealer Price | Specialist Price | What It Involves | Longevity / Suitability |
|---|---|---|---|---|
Minor - Preventative Belt Replacement Minor | £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 Best Value | £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 |
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.
The Alfa Romeo 166's engines are robust when maintained, but neglecting timing belts, injectors or cooling systems leads to costly failures. EngineMarket makes it simple to compare prices from trusted UK Alfa Romeo 166 specialists for rebuilt, reconditioned and used engines. Every unit includes upgraded components addressing known failure points and a minimum 12-month unlimited mileage warranty. Compare quotes today and get your 166 back on the road without the main dealer premium.
Compare Alfa Romeo 166 Engine Replacement Prices Now →
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)
Complete engine replacement service including removal, fitting, fluids and road test by Alfa-specialist technicians nationwide.
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 |
Injector wear on high-mileage units, swirl flap actuator failure on pre-2004 engines, EGR clogging causing limp mode
Not sure which engine size your Alfa Romeo 166 needs- Enter your registration number above - we'll identify the exact displacement, engine code and compatible replacement options instantly. All engines supplied through EngineMarket include a minimum 12-month unlimited mileage warranty from UK Alfa Romeo 166 specialists.
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.
The 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.
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.
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.
Alfa Romeo 166 engine replacement costs typically range from £750 for a used 2.0 Twin Spark to £3,500 for a rebuilt 3.2 Busso V6, depending on engine type, condition and whether you choose supply-only or supply & fit.
The Busso V6 is mechanically robust when maintained, but its interference design means timing belt failure causes catastrophic damage - strict 60,000-mile belt changes are essential for reliability.
Rough running on the 2.4 JTD is most commonly caused by worn high-pressure injectors, though EGR valve clogging and swirl flap actuator failure can also trigger misfires and limp mode.
Many Busso V6 engines share architecture across 156, GTV and 166 models, but ECU compatibility, emissions equipment and mounting points require careful matching - consult a specialist before sourcing.
Well-maintained 166 engines can exceed 200,000 miles, with Busso V6 units known for longevity when timing belts are changed on schedule and oil quality is maintained.
Variator rattle indicates worn cam phasers that affect timing accuracy - while not immediately catastrophic, ignoring it risks poor performance and increased wear on timing components.
The 20v MultiJet JTD (2004+) offers 175-185hp versus 136-150hp for the 10v unit, with better breathing, torque delivery and refinement, but requires more complex injector coding after replacement.
For catastrophic failures like timing belt snap, replacement with a rebuilt unit is usually more cost-effective than attempting repair; for minor issues, targeted rebuild may suffice.
Used engines can offer good value if sourced carefully with compression tests and service history, but verify mileage and condition to avoid inheriting the same failure that affected the donor car.
Yes - EngineMarket connects you with vetted UK Alfa Romeo 166 specialists offering supply-only or full supply & fit services nationwide, with every rebuilt engine backed by a 12-month warranty.
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Join thousands of UK drivers who compare Alfa Romeo 166 engine prices through our network of trusted specialists - every rebuilt and reconditioned unit backed by a minimum 12-month unlimited mileage warranty and nationwide delivery.
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UK Engine Replacement Services for Alfa Romeo 166
Covering every variant from budget 2.0 TS to flagship 3.2 Busso V6, with supply-only or full supply & fit available nationwide.
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