IsItAGoodCar
Reliability Guide

Common Problems with the
2017 McLaren 720S / 765LT

The 720S launched as McLarens Super Series flagship, featuring a 4.0-litre twin-turbo V8 producing 710bhp. These early cars are the most affordable but carry the same PCC accumulator concerns as previous models. The 720S benefited from the second-generation PCC system.

What changed for 2017

  • •UK launch of 720S
  • •4.0-litre twin-turbo V8
  • •PCC II suspension system

Common MOT watch-outs

  • !PCC II accumulator failure
  • !Paint bubbling from aluminium oxidation
  • !IRIS infotainment glitches
3
Known Issues
1
Serious
1
Moderate
1
Minor

All Known Issues

Accumulator Failure (PCC II)

SeriousSuspension & Chassis

The nitrogen-filled hydraulic accumulators that manage roll and pitch eventually fail, leading to a harsh ride and suspension warnings.

Est. Repair Cost: £1,500–£2,200
Warning Signs:

Suspension Fault warning, Excessively bouncy or harsh ride, Power steering pump whining

What to Inspect:
  • Drive the car over a series of small bumps at moderate speed
  • Listen for hydraulic pump strain when selecting lifting modes
Verified by IsItAGoodCar Research Team

Stress Cracks in Gorilla Glass

ModerateBodywork & Rust

The specialized lightweight glass used for the upper door sections and pillars can develop stress cracks.

Est. Repair Cost: £1,500–£3,000 per panel
Warning Signs:

Visible hairline cracks in the glass panels, Water ingress during heavy rain

What to Inspect:
  • Close inspection of all glass panels, particularly where they meet the bodywork
Verified by IsItAGoodCar Research Team

Panel Alignment and Trim Gaps

MinorBodywork & Rust

Earlier production cars occasionally show inconsistent panel gaps, especially around the front trunk (frunk) and rear deck.

Est. Repair Cost: £500–£1,500 (Adjustment)
Warning Signs:

Uneven gaps between body panels, Trim pieces feeling loose

What to Inspect:
  • Visual walkaround focusing on panel consistency
Verified by IsItAGoodCar Research Team

Buying Tips for 2017 McLaren 720S / 765LT

  • ✓Check the PCC II accumulators for wear
  • ✓Inspect the paintwork for bubbling
  • ✓Verify the IRIS system is responsive
2018
Check a 2017 McLaren 720S / 765LT by Registration