MajorVery commonEngine

Nissan Skyline: RB25DET NEO Variable Cam Timing (VCT) Oil Control Solenoid Wear

RB25DET NEO Variable Cam Timing (VCT) Oil Control Solenoid Wear is a very common engine fault on the Nissan Skyline on the 1998–2002 cars, and we rate it major. Putting it right costs $300 to $900 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 41 documented faults on the Nissan Skyline.

Vehicle: Nissan Skyline
Engine: RB25-DET
Years: 1998–2002
Fuel: petrol
System: Engine

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

All Nissan Skyline faults41 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 R34 Skyline uses the RB25DET NEO engine fitted with variable cam timing on the intake camshaft, controlled by an oil pressure solenoid (VCT solenoid). The solenoid develops wear in its spool valve internals and its filter screen blocks with sludge, causing erratic cam timing advance/retard. Symptoms include rough idle, lumpy low-rpm running, and a Check Engine Light with codes P0340/P0341 or equivalent cam sensor faults. The fault is highly sensitive to oil change frequency — sludged engines with neglected service intervals present this fault almost universally on R34 imports of this age.

What you would notice

Rough or lumpy idle particularly when warm
Check Engine Light with camshaft position sensor or VCT fault codes
Hesitation and poor throttle response at low RPM
Rattling from top of engine on cold start (cam timing not advancing correctly)
Slightly elevated oil consumption

How to check it

Where to look. VCT oil control solenoid on the front of the cylinder head, adjacent to the camshaft sprocket

Start the engine cold and listen for rattling or hunting idle in the first 30 seconds.
Rev the engine gently to 2000–2500 rpm and check for smoothness — a faulty VCT solenoid causes a noticeable stumble at the transition point.
Ask when the oil was last changed and what grade was used.
If a workshop inspection is possible: Connect an OBD scanner and check for cam timing or VCT-related fault codes.

What it costs to put right

$300 to $900 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

“Has the VCT solenoid or filter screen been cleaned or replaced?”
“What oil change interval has been followed?”
“Has the Check Engine light appeared, and what codes were stored?”

Now check the Nissan Skyline 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.

Nissan Skyline buyer questions

Is rb25det neo variable cam timing (vct) oil control solenoid wear serious on a Nissan Skyline?

We rate it major and very common on the Nissan Skyline. The R34 Skyline uses the RB25DET NEO engine fitted with variable cam timing on the intake camshaft, controlled by an oil pressure solenoid (VCT solenoid). The solenoid develops wear in its spool valve internals and its filter screen blocks with sludge, causing erratic cam timing advance/retard. Symptoms include rough idle, lumpy low-rpm running, and a Check Engine Light with codes P0340/P0341 or equivalent cam sensor faults. The fault is highly sensitive to oil change frequency — sludged engines with neglected service intervals present this fault almost universally on R34 imports of this age.

How much does it cost to fix on a Nissan Skyline?

$300 to $900 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 Nissan Skyline years are affected?

Our research records this fault on the 1998–2002 Nissan Skyline. 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?

Start the engine cold and listen for rattling or hunting idle in the first 30 seconds. Rev the engine gently to 2000–2500 rpm and check for smoothness — a faulty VCT solenoid causes a noticeable stumble at the transition point. Ask when the oil was last changed and what grade was used. If a workshop inspection is possible: Connect an OBD scanner and check for cam timing or VCT-related fault codes. Look here: VCT oil control solenoid on the front of the cylinder head, adjacent to the camshaft sprocket