Engine Family
AJ20P6 / P400
Jaguar AJ20P6 EngineSpecs, Reliability& Replacement Cost
The Jaguar AJ20P6 is a modern 3.0-litre straight-six petrol - strong and refined, but cooling system monitoring is essential. Backed by 80+ real UK enquiries in 2025 [EM-VERIFIED].
80+ Enquiries
2 Models Fitted
70/100 Engine Score
Part of Engine Finders
Jaguar AJ20P6 / P400
Engine Overview
All the essential specifications, performance data, and compatibility information at a glance.
Engine Family
AJ20P6 / P400
Fuel
Petrol
Configuration / Displacement
3.0L I6 Turbo Mild‑Hybrid
Power Range
340–400 bhp
Years Produced
2019–present
Models Fitted (Jaguar only)
2 (F‑Pace, XF)
Cross-Brand Fitment
Also fitted to Land Rover
Overall Engine Score
70/100
★★★★☆
Verdict & Rating
Rating:
5
out of 5
85% - based on 80 UK enquiries and early-market specialist feedback.
The AJ20P6 is a capable, modern six-cylinder - but early examples need coolant system vigilance - buy with a full JLR service history.
Engine Score breakdown:
DimensionScore (of 20)
Reliability
3.5★ × 4
14 /20
Repair Cost
Midpoint of reconditioned range (£6,000) → £5,000–£6,999 bracket
12 /20
Repairability
A mix of manageable cooling issues and more complex timing-chain work
12 /20
Parts Supply
Available but not yet as ubiquitous as older engines; JLR-specific parts
12 /20
Replacement Economics
Reconditioned cost against lowest host value (~£30,000) is well under 30%
20 /20
Total Engine Score
70 / 100
Best for:
Drivers wanting a smooth, powerful petrol SUV or saloon with reasonable running costs.
Avoid if:
Buyers expecting the simplicity of older naturally-aspirated sixes.
Compatible Jaguar Models
Jaguar AJ20P6 / P400 engines are fitted across 2 (F-Pace, XF) from 2019–2020.
Jaguar Exclusive Engine
This is an exclusive Jaguar engine. No cross-platform sharing.
2019
1 Years of Production
2020F-Pace
Generation
X761Variant/Badge
P400 (3.0 I6 MHEV)
Years
2020–present
XF
Generation
X260Variant/Badge
P400 (3.0 I6 MHEV)
Years
2020–present
Other Jaguar Models
AJ20P6 / P400 also appears in limited variants and markets.
Compatibility Verified
All compatibility data verified from Jaguar parts catalogues and specialist databases. [JAGUAR-VERIFIED]
Also powers the Land Rover Range Rover, Velar and Defender → [link].
Jaguar AJ20P6 / P400Engine Price Guide
All prices are estimates from UK specialists [EM-QUOTE]
Fitting an AJ20P6 typically takes 12–16 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer) [EM-QUOTE].
Parts cost is identical across Jaguar and Land Rover applications; labour time varies slightly by engine bay access.
USED
Supply Only
£2,500–£4,500
[EM-QUOTE]
Fitted (Indie)
£3,280–£5,540
3–6 months
RECONDITIONED
Supply Only
£4,500–£7,500
[EM-QUOTE]
Fitted (Indie)
£5,280–£8,540
12 months
REBUILT
Supply Only
£6,500–£10,000
[EM-QUOTE]
Fitted (Indie)
£7,280–£11,040
12–24 months
Compare Prices from UK specialists
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Jaguar AJ20P6 / P400Engine Price Guide
All prices are estimates from UK specialists
[EM-QUOTE]
USED
Supply Only
£2,500–£4,500
[EM-QUOTE]
Fitted (Indie)
£3,280–£5,540
Warranty
3–6 monthsRECONDITIONED
Supply Only
£4,500–£7,500
[EM-QUOTE]
Fitted (Indie)
£5,280–£8,540
Warranty
12 monthsREBUILT
Supply Only
£6,500–£10,000
[EM-QUOTE]
Fitted (Indie)
£7,280–£11,040
Warranty
12–24 monthsFitting an AJ20P6 typically takes 12–16 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer) [EM-QUOTE].
Parts cost is identical across Jaguar and Land Rover applications; labour time varies slightly by engine bay access.
Frequently Asked Questions
Expert answers to the most common Jaguar AJ20P6 / P400 engine questions.
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