Toyota A25A-FKS 2.5 D-4S Engine Specs, Problems & Reliability


Toyota A25A-FKS 2.5 D-4S Engine

Here in this post, I have gathered information about the Toyota A25A-FKS 2.5 D-4S Engine from its official website, including its specifications, Problems, and Reliability.

We believe in providing reliable information to our readers, therefore we prefer to obtain information on the Toyota A25A-FKS 2.5 D-4S Engine from authentic sources.


This article, which has been updated, has all the information you require about the Toyota A25A-FKS 2.5 D-4S Engine.

The A25A-FKS, also known as the 2.5 D-4S, is the first member of Toyota’s new “Dynamic Force Engines” family, which was unveiled in 2016.

It’s a 2.5-litre, 4-cylinder gas engine with the latest improvements in Toyota’s internal combustion technologies that have been seen in all of the company’s previous engine designs.

The A25A engine utilizes a brand-new open-deck aluminium alloy cylinder block with sleeves cast directly in the block material.


There is a ten-millimetre difference between the cylinder axes and the crankshaft’s longitudinal axis. There are seven standard counterweights and one tooth gear on the crankshaft.

The balancer, located on the underside of the engine block, is driven by the corresponding gear on the crankshaft.

Lightweight T-shaped aluminium pistons with a unique resin coating and high-strength connecting rods were added to the engine.

DLC is applied to the compression and oil rings in the top region (DLC stands for “diamond-like carbon”).

Two oil jets, one for each piston, spray engine oil to cool the pistons. Also improved was the oil distribution system. The key improvement is an electronic control module (ECM)-operated second-generation variable-pressure oil pump.

Toyota A25A-FKS 2.5 D-4S Engine

Production years since 2017
Displacement, cc 2487
Fuel system combined injection D4-S
Power output, hp 200 – 210
Torque output, Nm 240 – 250
Cylinder block aluminium R4
Blockhead aluminium 16v
Cylinder bore, mm 87.5
Piston stroke, mm 103.4
Compression ratio 13.0
Features balancers
Hydraulic lifters yes
Timing drive chain
Phase regulator VVT-iE + VVT-i
Turbocharging no
Recommended engine oil 0W-20
Engine oil capacity, litre 4.5
Fuel type 95
Euro standards EURO 6
Fuel consumption, L/100 km (for Toyota Camry 2021)
— City
— highway
— combined
Engine lifespan, km ~250 000

Toyota 2AR-FE Engine Problems

With its 2.5-litre inline-four design, Toyota debuted the 2AR-FE in 2008. It’s still available as an engine choice in the Toyota Camry and RAV4. The 2AR-FE engine produces between 169 and 180 horsepower.

This may not seem like a lot of power in comparison to other engines today, but it serves the engine’s intended purpose.

The 2AR-FE is an excellent means of transportation due to its low vibration levels, high durability, and high efficiency.

Although effective, no engine is without flaws. However, we can’t deny that the Toyota 2AR-FE comes close in terms of dependability.


The overall dependability of the Toyota 2AR-FE engine and some of the most common issues with it are discussed below.

The water pump in your Toyota 2AR-FE has failed.

The 2AR-FE is not alone among engines in experiencing issues with the water pump. There are multiple causes of water pump failure in Toyota 2.5L engines.

One common cause is a loss of coolant caused by a faulty water pump. In spite of this, 2AR-FE pumps might have internal failure and stop pumping adequate coolant through the engine, which can cause serious consequences.

As the engine can overheat rapidly without adequate coolant flow, the latter failure is more urgent. To reiterate, this is not a widespread issue with 2AR-FE engines.

Be wary, though, in case your water pump fails. It’s imperative that you find a safe place to pull over immediately and stop using the vehicle’s engine until the water pump is repaired.

  • Visible leak
  • Boiling coolant
  • Check engine light

Transmission Problems in the 2AR-FE Toyota Camry and RAV4

Usually, the articles in this series are aimed at solving actual engine problems, but there isn’t much of a problem with the Toyota 2AR-FE to discuss.

However, we are including the transmission because it is an integral part of the drivetrain.

We feel it is important to emphasize this again. When it comes to the 2AR-FE, transmission issues are relatively rare.

That’s something we keep harping on because it’s one of the most dependable engines we’ve covered.

  • Jerky shifts
  • Rough shifts
  • Reverse not working

Repair of a 2.5-Liter I-4 Transmission

Repairs to a faulty transmission don’t come cheap. In most cases, you will need to have the transmission rebuilt or replaced.

Some problems may have been resolved with the latest revisions to the engine control software. If not taken care of, the cost to rebuild or replace the transmission on a 2AR-FE engine will easily rise above $1,000.

Problems are uncommon, so this shouldn’t deter potential visitors. If you’re going to purchase a 2AR-FE Toyota Camry or RAV4, check the transmission first.

Engine Knocking Noises on a Toyota 2.5L

This part will be over quite quickly. The Toyota 2AR-FE engine rarely makes audible knocking noises. Knocking can indicate major concerns, but it can also be bothersome.

Fortunately, this is a minor problem with the 2AR-FE 2.5L engine and has little effect on reliability or longevity.

After starting, the engine knocks for certain drivers. The knocking noises only occur at first when the engine is cold and disappear after a few seconds to a minute.

It all comes down to a snafu with the 2AR-FE VVT (variable valve timing) gears.

Toyota A25A-FKS 2.5 D-4S Engine Reliability

Is Toyota’s 2AR-FE engine a dependable option? Three times, yes! We’ve written about a lot of engines, and the 2.5L 2AR-FE stands out as one of the most dependable we’ve covered. There are no significant issues that affect a wide variety of motors.

It’s a sturdy motor designed to transport you from point A to point B without incident. When it comes to its intended purpose, the 2AR-FE performs admirably.

However, the longevity of the Toyota 2AR-FE engine depends greatly on how well you care for it. Always use high-quality oil and swap it out as soon as the manufacturer suggests, if not sooner.

The 2AR-FE transmission is prone to failure, so regular fluid checks and fluid replacements are essential.

Whenever issues arise, make sure they are addressed immediately. It’s all fairly fundamental and makes a big difference.

We can’t guarantee 100% accuracy because some of it depends on chance.

However, the vast majority of Toyota 2AR-FE engines that are regularly serviced should have no trouble going over 200,000 miles without experiencing any serious breakdowns.

Toyota A25A-FKS 2.5 D-4S Engine FAQ 

Is the A25A FKS a good engine?

The A25A-FXS is the most advanced and powerful of the three Dynamic Force designs; the M20A-FKS and A25A-FKS are also very good engines.

Even though most versions of this engine from 2022 only have 176 horsepower, it gets very good gas mileage.

Which Toyota lasts the longest?

According to research conducted by, the Toyota Sequoia has the longest expected lifetime at 296.509 miles.

An automotive research website looked at data on over 2 million vehicles to determine which last the longest and came up with a list of 20 makes and models that can go over 200,000 miles without needing major repairs.

What is Toyota D 4S?

There are direct-injection fuel injectors and a fuel pump located in the intake manifold. The first vehicle to use this system, Toyota’s D-4S or Dynamic Force Engine (the “S” stands for superior), was the Lexus GS SUV powered by a V8.

Which Lexus has a D4S engine?

The IS 250, IS 350 and IS F all have a direct injection system with either D-4 (IS250) or D-4S (IS350 and IS F) gasoline injectors (D-4S only).


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