Land Rover Defender 90 P425 Engine Replacement Compare Prices & Get Quotes

A full reconditioned or rebuilt Land Rover Defender 90 P425 engine typically costs between £5,500 and £12,000 for the unit itself, depending on the level of rebuild.

• Used units can be found from £3,000, but carry higher risk for a high-performance V8.
• Supply and fit labour will add approximately £910-£1,170 depending on the specialist.

Early detection is critical to preventing catastrophic damage to your AJ133 V8 engine.

• Listen for a distinct rattling or whining noise from the supercharger on deceleration.
• Look for unexplained coolant loss, sweet smells from the engine bay, or overheating warnings on the dashboard.

Yes, absolutely, given the high retained values of the L663 V8 Defender range.

• A rebuilt AJ133 engine with upgraded supercharger couplers and cooling components can extend the vehicle's life significantly.
• For vehicles valued over £80,000, a warranted reconditioned engine protects your investment far better than a cheap used unit.

Both variants use the same legendary 5.0-litre supercharged V8 hardware.

• The P425 is intentionally detuned via a revised ECU map to produce 425 PS, offering a smoother, more refined daily driving experience.
• The P525 produces 525 PS, prioritising maximum peak performance.

A straightforward supply and fit of a reconditioned AJ133 engine typically takes 3 to 5 days at a specialist workshop.

• This allows time for proper bedding-in procedures, ECU calibration, fluid checks, and a thorough road test to ensure the V8 powertrain is balanced and performing correctly.