How much does a Jaguar F-Pace S or P400 engine replacement cost in the UK?

A reconditioned AJ126 engine typically costs £4,500–£7,500 supply only; a reconditioned AJ20P6 costs £5,000–£8,500. Used units are available from £3,000–£5,000. Fitting adds £1,500–£2,500. One owner reported a shocking £23,000 bill for an engine replacement on a low-mileage F-Pace - highlighting the importance of warranty coverage.

Is the Jaguar F-Pace S / P400 engine reliable?

It depends on the generation. The AJ126 (2016–2020) has well-documented weaknesses: plastic coolant pipes that crack catastrophically and timing chain tensioner wear. The AJ20P6 (2021+) Ingenium straight-six is more modern with promising early reliability, but the complex 48V mild-hybrid system is unproven long-term. Both demand diligent maintenance.

What are the common problems with the Jaguar F-Pace S and P400?

AJ126: plastic coolant pipe failure (catastrophic - upgrade to aluminium pipes), timing chain tensioner wear (at 60,000–90,000 miles), supercharger coupler wear, oil leaks. AJ20P6: mild-hybrid system complexity, potential oil filter housing issues (subject to recall), and general Ingenium petrol engine maintenance. The AJ126's cooling system is the single biggest concern.

Is it worth replacing a Jaguar F-Pace S / P400 engine, or should I scrap the car?

F-Pace values remain strong - a well-kept example is often worth £18,000–£40,000+. A £4,500–£8,500 reconditioned engine is 15–35% of the vehicle's value - within the Jaguar 60% scrap threshold. If the car is a cherished example with good bodywork and interior, replacement is often worthwhile. However, given the £23,000 replacement bill reported, ensure you understand the full cost before committing.

How do I find my Jaguar F-Pace S or P400 engine code?

Listed on the VIN plate and vehicle documentation. Pre-facelift (2016–2020) uses AJ126; facelift (2021+) uses AJ20P6. Tell us your registration date and we'll confirm it for free.

Can I repair the AJ126 plastic coolant pipes, or do they need replacement?

They need replacement - the plastic pipes crack and cannot be reliably repaired. Replacement with upgraded aluminium pipes costs £600–£1,500 and is highly recommended. If the pipes fail and cause overheating, the engine can be destroyed. At the first sign of coolant loss or bubbling coolant, book an inspection immediately.

Jaguar F-Pace S / P4002016–present2 Engine Generations

Jaguar F-Pace S 3.0 SC / P400 Engine Replacement - Compare Prices & Get Quotes

Name: Jaguar F-Pace S / P400 UK Engine Enquiry Data 2025
Creator: JaguarEngine.uk

The F-Pace S and P400 are powered by two of Jaguar's most potent six-cylinder engines - the supercharged AJ126 V6 in pre-facelift cars and the electrified Ingenium straight-six in later models. Both deliver effortless performance, but cooling system weaknesses and timing chain risks are well-documented. Get quotes from UK specialists for reconditioned, rebuilt and used units today.

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Supply & Fit Available

12-Month Warranty

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Jaguar F-Pace S / P400 Engines - from £3,000 to £8,500Common codes: AJ126, AJ20P6

Jaguar F-Pace S / P400 Engines - from £3,000 to £8,500· Common codes: AJ126, AJ20P6

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

The F-PACE S / P400 THROUGH TIME Era Map

Four generations. Four eras. One guide to reliability, costs and what really matters.

GenerationYearsEngine CodeReliabilityRecon CostEra Note

Why use this era map?

Every cost guide, reliability rating and engine code on this page is aligned to the data above. This keeps everything consistent and trustworthy.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

Jaguar F-Pace S / P400 Engine Replacement Costs

Supply Only£4,500–£7,500

Fitted (Indie)£6,000–£9,000

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£3,000–£5,000£4,500–£7,0001–6 monthsBudget priority; lower‑mileage examples

Reconditioned Engine£4,500–£7,500£6,000–£9,00012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£6,000–£8,500£7,500–£10,50012–24 monthsLong‑term ownership; 3+ year horizon

Main Dealer New£8,000–£12,000+£10,000–£14,000+24–36 monthsInsurance jobs, warranty claims

Figures above reflect the current F-Pace S/P400 market. AJ126-engined cars sit at the lower end of the range; AJ20P6 Ingenium straight-six examples command a premium. One owner reported a £23,000 engine replacement bill on a low-mileage F-Pace - highlighting the importance of warranty coverage on these complex engines.

Labour estimate: Fitting an F-Pace S/P400 engine typically takes 14–18 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer). The V6's supercharger and the inline-six's mild-hybrid system add complexity.

Compare F-Pace S / P400 engine prices from UK specialists

Common Problems

1. Plastic Coolant Pipe Failure (AJ126 - Pre-Facelift)

Symptoms: Coolant loss with no visible external leak, rising temperature gauge, steam from the engine bay, overheating, bubbling coolant, warning light

Typical mileage: 40,000–80,000 miles

Repair cost: £600–£1,500 (replacement of plastic coolant crossover pipes)

Replacement cost: £4,500–£7,500 (if overheating causes engine damage)

🔴 Immediate - a cracked plastic coolant pipe can dump coolant rapidly, leading to catastrophic engine failure

Our recommendation:

The AJ126's cooling system is its single biggest weakness. The plastic crossover pipes under the supercharger become brittle with repeated heat cycles and can crack catastrophically. One owner reported: "It began with overheating, which I later traced to the cracked plastic V pipe under the supercharger-apparently a well-known weak spot on these engines that often fails catastrophically". Upgraded aluminium pipes are available on eBay and are highly recommended. Check coolant levels regularly. If you see bubbling coolant, stop driving immediately - the engine may already be damaged.

Read the full coolant leak guide

1. Plastic Coolant Pipe Failure (AJ126 - Pre-Facelift)

Symptoms: Coolant loss with no visible external leak, rising temperature gauge, steam from the engine bay, overheating, bubbling coolant, warning light

Typical mileage: 40,000–80,000 miles

Repair cost: £600–£1,500 (replacement of plastic coolant crossover pipes)

Replacement cost: £4,500–£7,500 (if overheating causes engine damage)

🔴 Immediate - a cracked plastic coolant pipe can dump coolant rapidly, leading to catastrophic engine failure

Our recommendation:

Read the full coolant leak guide

2. Timing Chain Tensioner and Guide Wear (AJ126)

Symptoms: Rattling noise on cold start, metallic ticking from the front or top of the engine, engine warning light, cam timing errors, eventual chain slip

Typical mileage: 62,000–93,000 miles (100,000–150,000 km)

Repair cost: £1,500–£3,500 (timing chain, tensioner, guide and sprocket replacement)

Replacement cost: £4,500–£7,500 (if chain jumps and causes valve interference)

🔴 Immediate - if the timing chain fails on this interference engine, pistons hit valves and the engine is destroyed

Our recommendation:

The AJ126 shares the same timing chain tensioner issues as the larger AJ133 V8, though they tend to occur at higher mileages. The timing chain's service life is typically 100,000–150,000 km (62,000–93,000 miles). If you hear rattling on cold start, book an inspection immediately. A preventative tensioner and guide replacement is far cheaper than a full engine replacement. Regular oil changes with the correct 5W-20 specification are essential.

Read the full timing chain failure guide

3. Supercharger Coupler Wear (AJ126)

Symptoms: Rattling noise from the supercharger at idle, metallic tick that changes with engine speed, reduced power delivery

Typical mileage: 60,000–120,000 miles

Repair cost: £400–£900 (supercharger coupler replacement)

Replacement cost: £2,500–£5,000 (if supercharger requires full rebuild)

🟡 Monitor - book inspection soon

Our recommendation:

The supercharger coupler/torsion isolator is a known wear item on both the AJ126 and AJ133 engines. It can become "very rattly" at higher mileages. If you hear a rattling noise from the engine at idle that changes with revs, have the supercharger coupler inspected. Replacement is a specialist job but far cheaper than a full supercharger rebuild.

Read the full supercharger failure guide

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F-Pace S / P400 Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

F-Pace S / P400 Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Can It Be Repaired?

ProblemRepairable?Typical CostWhen It Makes SensePlastic coolant pipe failure (AJ126)✅ Yes£600–£1,500Upgrade to aluminium pipes - cheaper than a new engineTiming chain tensioner (AJ126)✅ Yes£1,500–£3,500Labour-intensive but far cheaper than a full engine replacementTiming chain failure (engine damage)❌ Usually NoEngine replacementIf chain jumps and valves hit pistons, replacement is the only optionSupercharger coupler wear (AJ126)✅ Yes£400–£900Specialist replacement - well-understood and cost-effectiveMHEV system issues (AJ20P6)✅ Yes£500–£2,000New technology - ensure warranty coverageOil filter housing crack (AJ20P6)✅ Yes£800–£1,800Replacement under recall if applicable

Buying This F-Pace S / P400? Check These First

Buy If

Facelift model (2021+) with the AJ20P6 Ingenium straight-six - the more modern and efficient engine with promising reliability
AJ126-engined car with documented coolant pipe upgrade (aluminium pipes fitted) - the defining weakness addressed
Evidence of timing chain inspection or replacement on AJ126 cars over 60,000 miles
Full service history with correct JAG-spec oil (5W-20 for AJ126, 0W-20 for AJ20P6)
Car still under manufacturer warranty - these are complex, expensive engines to repair

Avoid If

AJ126 with no proof of coolant pipe work - plastic pipes will fail
AJ126 with any cold-start rattle - timing chain wear is likely
AJ126 with evidence of repeated coolant top-ups - the cooling system is failing
Poor service history - both engines are unforgiving of neglect
Any engine warning light without a clear diagnosis

Closing Verdict

The F-Pace S and P400 are powered by two very different six-cylinder engines. The AJ126 (2016–2020) is a supercharged V6 with a well-documented Achilles' heel - plastic coolant pipes that fail catastrophically, and timing chain tensioner wear at higher mileages. The AJ20P6 (2021+) is a modern straight-six with mild-hybrid technology - early reliability is promising, but the complex 48V system is unproven long-term. Buy on history, maintain religiously, and keep it under warranty. Skip the history and it will punish you.

Don't guess.Get the right engine at the right price.

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Buying Checklist

Before you buy a used Jaguar F-Pace S or P400 (or before you commit to an engine replacement), check these:

1. Coolant Level

Any unexplained loss? (AJ126 plastic coolant pipe warning - the most critical check on the pre-facelift car)

2. Cold Start

Any rattling? (AJ126 timing chain tensioner warning)

3. Supercharger Noise

Any rattling at idle? (AJ126 coupler wear warning)

4. Service History

including which generation (AJ126 or AJ20P6) and evidence of major maintenance

5. Oil Leaks

Any oil under the car? (AJ126 oil leaks or AJ20P6 oil filter housing recall)

6. MHEV Health (AJ20P6)

Any warning lights or reduced performance? (48V system issues)

7. Engine Warning Light

Have codes been read? Any unresolved issues?

8. MOT History

Check for emissions-related failures (catalyst, O2 sensors)

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Engine Codes

This table's rows match Section 1B's Era Map exactly - two engine families across the F-Pace S/P400's history.

AJ126

Years2016–2020

Power380 hp

2025 Enquiries[PATTERN DATA]

Avg. Recon Cost£4,500–£7,500 [JAG-QUOTE]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

AJ1262016–2020380 hp[PATTERN DATA]£4,500–£7,500 [JAG-QUOTE]

AJ20P62021–present395–400 hp[PATTERN DATA]£5,000–£8,500 [JAG-QUOTE]

Technical Specs

AJ20P6 - facelift

Displacement2,995cc (3.0-litre)

CylindersV6

Bore x Stroke84.5 mm x 89 mm

Compression Ratio10.5:1

Fuel SystemDirect injection

SuperchargerRoot-type supercharger

ValvetrainDOHC, 4 valves per cylinder

Oil SpecificationSAE 5W-20

Displacement2,996cc (3.0-litre)

CylindersStraight-6

Fuel SystemDirect injection

TurbochargerTwin-scroll turbocharger with electric supercharger

MHEV48V mild-hybrid system

→ Compare F-Pace S / P400 engine prices for your Jaguar

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Market Intelligence

Most Common Failure

AJ126: Plastic coolant pipe failure / AJ20P6: Unproven long-term reliability

the defining risks of each generation

Average Enquiry Mileage

AJ126: 50,000–80,000 miles / AJ20P6: 20,000–40,000 miles【PATTERN DATA】

Average Replacement Cost

AJ126: £4,500–£7,500 / AJ20P6: £5,000–£8,500 reconditioned, supply only【JAG-QUOTE】

Most Requested Engine Code

AJ126

the supercharged V6【PATTERN DATA】

Peak Enquiry Season

Spring

performance SUV season【PATTERN DATA】

Regional Demand

London22%

South East18%

South West (14%)【PATTERN DATA】

Regional Demand Breakdown

22%London

18%South East

Frequently Asked Questions

All prices are indicative UK market ranges based on historical quote data from our network of engine specialists. Actual costs vary by variant, engine code, damage severity and workshop location. Use our free comparison tool to get tailored quotes. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty - always confirm terms with your chosen supplier.

Trusted F-Pace Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real F-Pace S and P400 owners, as part of the Engine Finders network, across both the AJ126 and AJ20P6 generations - no matter which six-cylinder era your F-Pace belongs to.
Compare F-Pace S / P400 Engine Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit, with specialists who genuinely understand the AJ126's coolant pipe, timing chain, and supercharger nuances, and the AJ20P6's mild-hybrid complexity.
UK Engine Replacement Services for F-Pace S / P400
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