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Toyota Mark X: 4GR-FSE VVT-i Actuator Cold-Start Rattle

4GR-FSE VVT-i Actuator Cold-Start Rattle is a common engine fault on the Toyota Mark X on the 2004 onward cars, and we rate it major. Putting it right costs $900 to $2,800 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 23 documented faults on the Toyota Mark X.

Vehicle
Toyota Mark X
Engine
4GR-FSE
Years
2004 onward
Fuel
petrol
System
Engine

This page covers the Toyota Mark X as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Toyota Mark X faults23 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph for this fault yet. We would rather show none than show a picture of something else.

What goes wrong

The 4GR-FSE 2.5L V6 uses Variable Valve Timing-intelligent (VVT-i) actuators on the intake camshafts of both banks. On cold starts, low oil viscosity and slow oil-pressure build-up allow the VVT-i helical-gear actuators to rattle momentarily before hydraulic lock is established. Repeated cold-start rattles accelerate wear on the actuator vane and housing, eventually producing permanent noise or a stored VVT fault code.

What you would notice

  • Distinct metallic rattling or chattering from the top of the engine for 1–5 seconds immediately after a cold start, clearing once oil pressure builds
  • Rattle worsens in cold ambient temperatures below 10°C
  • OBD-II fault codes P1349 (VVT system malfunction bank 1) or P1346 (bank 2) stored after extended wear
  • Timing chain secondary noise accompanying the VVT rattle as the actuator creates brief chain slack

How to check it

Where to look. Top of engine at each camshaft sprocket, behind the valve covers on both banks

  1. Cold-start the engine from fully cold (overnight soak).

  2. Listen at the top of the engine for a rattle that appears immediately and clears within five seconds.

  3. Scan for P1349/P1346 VVT codes.

  4. Check oil condition and level — degraded oil accelerates actuator wear.

  5. If a workshop inspection is possible: With the engine warm, use a stethoscope on each camshaft end cover to isolate which bank is louder.

What it costs to put right

$900 to $2,800 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

  • “Does the engine make any ticking or rattling noise when first started, particularly on a cold morning?”
  • “Has the oil been changed on schedule with the correct 0W-20 or 5W-30 specification?”

Now check the Toyota Mark X you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.

Toyota Mark X buyer questions

Is 4gr-fse vvt-i actuator cold-start rattle serious on a Toyota Mark X?

We rate it major and common on the Toyota Mark X. The 4GR-FSE 2.5L V6 uses Variable Valve Timing-intelligent (VVT-i) actuators on the intake camshafts of both banks. On cold starts, low oil viscosity and slow oil-pressure build-up allow the VVT-i helical-gear actuators to rattle momentarily before hydraulic lock is established. Repeated cold-start rattles accelerate wear on the actuator vane and housing, eventually producing permanent noise or a stored VVT fault code.

How much does it cost to fix on a Toyota Mark X?

$900 to $2,800 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Toyota Mark X years are affected?

Our research records this fault on the 2004 onward Toyota Mark X. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.

How do I check for it before I buy?

Cold-start the engine from fully cold (overnight soak). Listen at the top of the engine for a rattle that appears immediately and clears within five seconds. Scan for P1349/P1346 VVT codes. Check oil condition and level — degraded oil accelerates actuator wear. If a workshop inspection is possible: With the engine warm, use a stethoscope on each camshaft end cover to isolate which bank is louder. Look here: Top of engine at each camshaft sprocket, behind the valve covers on both banks