Toyota Mark X common problems: what to check before you buy
Credov's researched list of the 2 faults the Toyota Mark X is known for (2005–2009), 2 of them serious or costly. Each one says what to look for when you check the car, so you can spot it before you buy. Not every car has these faults: they are the ones worth checking on this model.
Known problems on the Toyota Mark X
Carbon on the intake valves
Costly if missed
2005–2009 · 4GR-FSE, 3GR-FSE · petrol · Engine
What to look for: Cold start and watch the tacho and feel through the seat for a shaky or hunting idle in the first minutes.
Why it matters: Owners of the same engine in the Lexus IS250/GS300 report it from as little as 50,000 km, and more often past 100,000 km on cars doing short runs. The fix is a walnut-shell blast clean of the valves with the intake manifold off (about 3 hours' work for two technicians); it comes back again with mileage. Cheap fuel-additive 'cleans' do not reach the valves.
What to look for: Cold start and watch the tacho and feel through the seat for a shaky or hunting idle in the first minutes.
Why it matters: Owners of the same engine in the Lexus IS250/GS300 report it from as little as 50,000 km, and more often past 100,000 km on cars doing short runs. The fix is a walnut-shell blast clean of the valves with the intake manifold off (about 3 hours' work for two technicians); it comes back again with mileage. Cheap fuel-additive 'cleans' do not reach the valves.
Got a question about a Toyota Mark X? Ask Credov: a noise, a warning light, a part or how to fix it.
Also check on every car
On top of the faults above, every Credov inspection covers the basics: fuel smell, leaks or filler rust, engine oil leaks, power steering fluid leak, drive belt cracks or squeal, rust underneath: chassis and mounts, engine mounts, engine oil level and colour, coolant level, colour and leaks, head gasket failure signs, cold start: rattle, knock or smoke, rough or hunting idle, engine running hot on gauge, gearbox or diff oil leak, swapped gearbox without lvv and more.
Researched by Credov from manufacturer recalls and service bulletins, owner reports and workshop sources. Repair prices are typical ranges, not quotes. See also fault codes and repair costs.