IsItAGoodCar
Reliability Guide

Common Problems with the
2014 McLaren 12C

The final year of 12C production before the 650S replacement. These last cars are the most refined and best-maintained, with all accumulated improvements applied.

What changed for 2014

  • •Final production year
  • •All accumulated improvements applied
  • •Limited availability of low-mileage examples

Common MOT watch-outs

  • !PCC accumulator deterioration
  • !Paint bubbling
  • !IRIS glitches
3
Known Issues
1
Serious
2
Moderate
0
Minor

All Known Issues

PCC Hydraulic Accumulator Failure

SeriousSuspension & Chassis

The nitrogen-filled accumulators are wear items with a 3-5 year lifespan. When they fail, the car feels excessively stiff (often called riding on "wagon wheels"). This also causes steering "dead spots" as the system loses pressure regulation. While dealers charge £3,000+, specialists like Thorney Motorsport offer full sets for ~£1,500–£1,800.

Est. Repair Cost: £1,500–£1,800 (Specialist Set)
Warning Signs:

Excessively harsh ride, "Wagon wheels" feel, Suspension Fault warnings, Steering dead spots, Mode settings (Normal/Sport/Track) make no difference

What to Inspect:
  • Drive the car over small bumps; it should be supple in Normal mode
  • Listen for hydraulic pump strain
  • Check steering for inconsistent weight
Verified by IsItAGoodCar Research Team

Coolant Hose and Radiator Leaks

ModerateCooling System

Early McLarens are known for gradual coolant loss from hose connections, clamps, and front-end cooling hardware. Left unresolved, small leaks can become expensive breakdowns.

Est. Repair Cost: £500–£1,800
Warning Signs:

Low coolant warning, Sweet smell after a drive, Pink or white residue on cooling pipes or undertrays

What to Inspect:
  • Inspect the front radiators and engine-bay hoses
  • Check coolant level before and after a test drive
  • Look for invoices showing hose-clamp or radiator work
Verified by IsItAGoodCar Research Team

Headlight Condensation and Delamination

ModerateBodywork & Rust

The headlight units on early 12Cs are prone to internal condensation and delamination of the lens coating.

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

Foggy headlights, Visible peeling inside the lens

What to Inspect:
  • Check headlights after washing or rain
  • Inspect for any signs of internal moisture
Verified by IsItAGoodCar Research Team

Buying Tips for 2014 McLaren 12C

  • The 2014 models are the most desirable 12C variants
  • Check for evidence of garage storage and low mileage
  • Verify all maintenance has been performed on schedule
2013
Check a 2014 McLaren 12C by Registration