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Toyota Rush: 3SZ-VE EGR valve carbon sticking causing rough idle

3SZ-VE EGR valve carbon sticking causing rough idle is a common engine fault on the Toyota Rush on the 2006–2017 cars, and we rate it major. Putting it right costs $220 to $950 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 13 documented faults on the Toyota Rush.

Vehicle
Toyota Rush
Engine
3SZ-VE
Years
2006–2017
Fuel
petrol
System
Engine

This page covers the Toyota Rush 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 Rush faults13 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the EGR valve yet. We would rather show none than show a picture of a different part.

What goes wrong

The exhaust gas recirculation valve on the 3SZ-VE accumulates carbon deposits on the valve pintle and seat in urban stop-start driving conditions. With sufficient fouling the valve sticks partially open at idle, admitting exhaust gas into the intake manifold and causing a lean misfire or hunting idle between 600–900 rpm. A fully stuck-open EGR also introduces soot directly into the combustion chamber, fouling spark plugs prematurely. Fault code P0400 (EGR flow insufficient) or P0402 (excessive EGR flow) is typically stored. Cleaning the valve restores function temporarily; replacement is usually required above 160,000 km.

What you would notice

  • Rough or hunting idle, especially when engine is at operating temperature
  • Check engine light with P0400 or P0402 stored
  • Black soot deposits visible around EGR inlet on intake manifold
  • Increased fuel consumption and occasional stumble under light throttle

How to check it

Where to look. EGR valve mounted on the rear of the intake manifold, connected to the exhaust manifold via a metal tube on the 3SZ-VE

With engine at operating temperature, check idle quality in Park. If a workshop inspection is possible: Connect an OBD reader and look for EGR-related codes. Remove the EGR vacuum line and inspect for heavy black soot. If accessible, remove the EGR valve and inspect the pintle for carbon buildup; it should move freely by hand.

Parts involved: EGR valve.

What it costs to put right

$220 to $950 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 EGR valve ever been cleaned or replaced?”
  • “Does the idle feel smooth and stable when the engine is fully warm?”
  • “Are there any pending or stored check-engine codes?”

Now check the Toyota Rush 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 Rush buyer questions

Is 3sz-ve egr valve carbon sticking causing rough idle serious on a Toyota Rush?

We rate it major and common on the Toyota Rush. The exhaust gas recirculation valve on the 3SZ-VE accumulates carbon deposits on the valve pintle and seat in urban stop-start driving conditions. With sufficient fouling the valve sticks partially open at idle, admitting exhaust gas into the intake manifold and causing a lean misfire or hunting idle between 600–900 rpm. A fully stuck-open EGR also introduces soot directly into the combustion chamber, fouling spark plugs prematurely. Fault code P0400 (EGR flow insufficient) or P0402 (excessive EGR flow) is typically stored. Cleaning the valve restores function temporarily; replacement is usually required above 160,000 km.

How much does it cost to fix on a Toyota Rush?

$220 to $950 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 Rush years are affected?

Our research records this fault on the 2006–2017 Toyota Rush. 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?

With engine at operating temperature, check idle quality in Park. If a workshop inspection is possible: Connect an OBD reader and look for EGR-related codes. Remove the EGR vacuum line and inspect for heavy black soot. If accessible, remove the EGR valve and inspect the pintle for carbon buildup; it should move freely by hand. Look here: EGR valve mounted on the rear of the intake manifold, connected to the exhaust manifold via a metal tube on the 3SZ-VE