Toyota MR-S: common faults & what to check

Which Toyota MR-S are you looking at?

1 generation variant documented. Pick the shape you recognise: the faults, the servicing and the timeline below all narrow to it. Free, no account needed.

Engine not documented

1 variant documented

2000–2007W302000–2007W30Engine not documented for this generationEngine not documentedDocumented issues5 knownSee faults & what to checkPhoto: Mytho88 via Wikimedia Commons, CC BY-SA 3.0.

Now narrow it to the engine

A 1.8 and a 2.4 of the same car do not fail the same way, so the faults below narrow to the engine as well as the year. Free, no account needed.

Start your free check on this Toyota MR-S

No plate needed. You get the risk score, the buyer's checklist and the guided inspection for the exact car you picked above — not the whole nameplate.

The checks worth doing on a Toyota MR-S before you hand over any money. Every documented fault is listed below, each with its own page.

• Serious issue

  Squeeze all coolant hoses with the engine cold — they should feel pliable.

  See why

  Coolant hose deterioration — mid-engine routing past exhaust

  The W20 MR2 routes coolant hoses from the front-mounted radiator through the firewall and past the mid-mounted exhaust components before reaching the engine. This extended routing exposes multiple hoses and the coolant expansion tank to sustained heat cycling. Original rubber hoses become hard, brittle and prone to cracking after 15–20 years. A burst hose can cause rapid coolant loss leading to overheating and head gasket or engine damage within minutes — especially dangerous in traffic. The steel coolant pipes that run through the sill/firewall area also corrode from the outside.

  What you would notice

  • Coolant loss without visible puddle under car (leak into hot exhaust area burns off)
  • Steam from engine bay or rear of car
  • Temperature gauge rising unexpectedly
  • Smell of hot coolant inside cabin

  Typically $400–$1,200 to put right.

• Serious issue

  Perform a cold-start and watch exhaust colour — white smoke that persists beyond warm-up is a key indicator.

  See why

  1ZZ-FE head gasket failure — coolant loss & white smoke

  The mid-mounted 1ZZ-FE in the ZZW30 MR2 Spyder is prone to head gasket failure caused by difficulty fully bleeding air from the cooling system and hot spots created by the engine's rear mid-ship location and restricted cooling airflow. The cylinder head gasket degrades under repeated heat cycles, allowing combustion gases to enter the coolant circuit or coolant to enter the combustion chamber. White sweet-smelling exhaust smoke, unexplained coolant loss, and rising coolant temperature are the primary indicators. Engine removal is required for repair in this chassis, making this a significant and expensive repair.

  What you would notice

  • White or grey sweet-smelling exhaust smoke particularly when at operating temperature
  • Coolant level dropping without any visible external leaks
  • Coolant temperature gauge rising higher than normal or intermittent overheating
  • Bubbles visible in the coolant reservoir with engine running
  • Oil contamination in coolant or milky residue under oil filler cap

  Typically $2,600–$5,800 to put right.

• Serious issue

  Test drive covering all paddle-shift changes both up and down.

  See why

  SMT sequential manual transmission actuator and solenoid failure

  The W30 MR2 Spyder was offered with Toyota's Sequential Manual Transmission (SMT), a robotised single-clutch automated manual gearbox. The hydraulic actuator that operates the clutch and shift forks relies on solenoid valves which fail with age. Failure modes include: clutch slipping under load, inability to engage a gear, harsh or refused downshifts, and complete loss of drive. The SMT control unit can also develop faults. Parts are now difficult to source through Toyota dealers and specialist rebuilders charge significant labour for diagnosis and repair. Many owners have converted to standard manual transmissions.

  What you would notice

  • Jerky, refused or missed gear changes
  • Warning light for SMT system
  • Clutch slipping or dragging — car creeps in neutral
  • Complete loss of drive with no fault code (actuator failure)
  • Transmission stuck in a single gear

  Typically $1,500–$5,500 to put right.

• Serious issue

  Open the front luggage compartment and locate the remote brake fluid reservoir.

  See why

  Brake master cylinder remote reservoir hose cracking

  The W20 MR2 uses a remote brake fluid reservoir mounted in the front luggage compartment, connected to the master cylinder by a rubber hose. This hose ages and cracks, causing air ingestion into the brake circuit. Because the hose is flexible and may only leak under vacuum (when the pedal is released), the failure can be intermittent and hard to diagnose. The result is a spongy or sinking brake pedal. On cars with ABS the hydraulic modulator O-rings also deteriorate, contributing to brake fluid loss from the ABS unit.

  What you would notice

  • Spongy or low brake pedal
  • Pedal slowly sinking under sustained pressure
  • Brake fluid level dropping with no visible puddle under the car
  • Air bleeding fails to firm up pedal consistently

  Typically $150–$600 to put right.

• Costly issue

  Check oil level and ask when it was last topped up.

  See why

  1ZZ-FE excessive oil consumption from piston ring wear

  The 1ZZ-FE engine fitted to base W30 MR2 Spyders shares the well-documented piston ring design flaw found across the Corolla/Matrix/MR2 1ZZ family. Piston oil control rings wear prematurely and lose tension, allowing oil to pass into the combustion chamber. Consumption rates of 1 litre per 1,000 km are common and can exceed that in neglected examples. This is distinct from head gasket or valve stem seal failure. Toyota issued a Technical Service Bulletin (TSB TC002-04) for the Corolla/Matrix and the same rings are used in the MR2 Spyder application.

  What you would notice

  • Blue smoke on startup or on overrun
  • Oil level dropping 1L or more per 1,000 km
  • Oily spark plugs on cylinders 2 and 3 (most commonly affected)
  • No external oil leaks found despite consumption

  Typically $2,500–$6,000 to put right.

• Costly issue

  With roof down, pour a small amount of water into the roof channel drains and verify it exits under the sills.

  See why

  Water ingress from blocked soft-top drain tubes

  The W30 MR2 Spyder soft top has four drain tubes routed to exit under the sills. These tubes are narrow and accumulate leaf litter and debris, blocking completely. When blocked, rainwater pools in the roof framework channels and finds its way into the cabin — typically saturating the rear bulkhead carpet, corroding the battery tray, and filling the storage pockets behind the seats. Prolonged water ingress causes ECU connector corrosion and electrical gremlins. The chassis rails in the sill area also rust from inside where standing water collects.

  What you would notice

  • Damp or musty smell inside cabin
  • Wet carpet at rear of cockpit particularly after rain
  • Intermittent electrical faults (SMT, windows, instruments) after wet weather
  • Visible water staining on rear bulkhead panels

  Typically $200–$1,500 to put right.

What these repairs cost on other cars

Some of the Toyota MR-S’s documented faults are repairs other models share. Each page lists the documented NZ cost for every model it affects.

• Head Gasket Repair Cost

Other Toyota models