Fuel Injectors For Subaru Forester 2.5L
specification & Features
Manufacturer Part Number
16600-AA170
OE/OEM Part Number
16600-AA170
Interchange Part Number
16600-AA170 16600AA170, FJ942, SF-61-550CC
Type
Fuel injector
Fuel Type
Gasoline
Material
Metal+Plastic
Manufacturer Warranty
1 Year
About Product
Upgrade your Subaru Forester 2.5L Turbo (EJ255/EJ257) with our precision-engineered fuel injectors, designed as exact replacements for OEM part 16600-AA170. Featuring a 4-hole laser-drilled nozzle for superior atomization, these injectors deliver smoother acceleration, 3-5% better fuel economy, and reduced turbo lag. The ethanol-resistant Viton seals prevent leaks from E10-E15 gasoline, solving common P0171/P0174 lean codes in high-mileage Foresters. With OEM-matched 380cc/min flow rate and 50-75 PSI durability, they're perfect for daily driving, performance upgrades, and off-road use. Backed by a 12-month warranty for worry-free ownership.
Products Advantage

1. 4-Hole Nozzle for More Accurate Performance
Our fuel injectors are made just for the Subaru Forester 2.5L Turbo (EJ255/EJ257). They have a high-tech 4-hole laser-drilled nozzle that works better than factory single-hole designs. This technology makes a finer fuel mist, which makes sure that combustion is more complete. This is very important for turbocharged engines that are likely to knock when they are boosted. Owners of 2008–2012 Foresters will find that their cars start up more quickly in the cold and get 3–5% higher gas mileage. Tuners will also like that the AFR (air-fuel ratio) stays the same for Stage 1–2 improvements.
2. Viton seals that don't break down in ethanol for long life
Many 2004–2012 Subaru Foresters have injector leaks because the original equipment manufacturer (OEM) seals have worn out, especially in areas where E10–E15 gasoline is used. Our Viton-sealed fuel injectors are chemically resistant to ethanol corrosion, which stops:
• Leaks in the fuel rail (common in Foresters with a lot of miles)
• Contamination of the vacuum system by evaporated fuel
• CEL codes P0171 and P0174 are caused by lean circumstances.
This makes our injectors perfect for Foresters that are driven every day in humid places or places where fuels are mixed with ethanol.
3. Flow rate of 380cc/min (±2%) set by the original equipment manufacturer
Each unit is dynamically verified to match the exact OEM 16600-AA170 flow parameters, unlike generic "universal fit" injectors. This accuracy:
• Stops lean/rich circumstances that cause check engine lights to come on
• Keeps the best turbo spool response in EJ255/EJ257 engines
• Keeps the car's emissions under the limits set by the factory for smog testing
Great for replacing stock parts or lightly modifying Foresters that can handle up to 18 PSI boost.
4. Durability that is optimized for turbo (50 to 75 PSI Rated)
These injectors are made for the high-pressure needs of the Subaru 2.5L turbo:
• Fuel rails made of stainless steel so they don't bend when the boost is on
• Coil windings that can handle high temperatures up to 230°F (110°C)
• Design to prevent cavitation for steady flow at WOT
Important for:
• Foresters with a lot of miles (over 100,000) and poor OEM injectors
• Performance builds that use aftermarket turbos or intercoolers
• Towing jobs that need a steady increase
5. Easy to Install
Includes all OEM-spec O-rings, cushions, and EV1 connectors for easy replacement. Not needed for:
• Changes to the fuel rail (fits OEM 2004–2012 Forester rails)
• More adapters for wire harnesses
• Reprogramming the ECU (for standard cars)
Perfect for mechanics who work on their own cars or shops that service a lot of Foresters. It lowers labor time by 30% compared to aftermarket options.

Main application scenarios

Daily Use for Commuting and Family
Our fuel injectors bring back factory-level fuel efficiency and smooth acceleration, making them perfect for Subaru Forester customers who use their cars for school runs, supermarket shopping, and city driving.
The 4-hole nozzle design is very precise and gets rid of problems like starting slowly and idling roughly, which are especially bad in stop-and-go traffic. These injectors can handle E10-E15 gasoline mixes thanks to their ethanol-resistant Viton seals. This makes them perfect for family SUVs that fill up at regular gas stations often.
Maintenance and Troubleshooting for High-Mileage Vehicles
Our injectors are a must-have for 2004–2012 Forester 2.5L Turbo cars with more than 100,000 km.
They fix:
• Check Engine Lights (P0171/P0174) because OEM injectors are leaking or blocked
• The smell of fuel in the cabin is caused by worn-out injector seals.
• Less power and miles per gallon because to irregular fuel supply
By meeting the OEM 16600-AA170 criteria, they offer a cheap repair that doesn't require going to the dealership, which is great for Subaru customers on a budget.


Upgrades for performance and turbo
These injectors are trusted by Subaru tuners for:
• Stage 1–2 ECU tuning (up to 350 HP)
• Aftermarket turbo kits that need a steady flow of 380cc/min
• Driving at high speeds without running out of gas
The 75 PSI rating, which is tuned for turbo, makes sure that fuel is delivered steadily when the engine is under boost. This stops lean circumstances that could hurt the EJ255/EJ257 engine.
Reliability when off-road and towing
For people who are eager for adventure Foresters used on dirt paths, mountain routes, or to tow small trailers, our injectors give:
• A steady supply of fuel even while going up steep hills or carrying big loads
• Strong enough to withstand vibration (which happens a lot when driving off-road)
• Can handle heat for long periods of time at high RPMs
The stainless steel structure keeps these injectors from bending, which makes them a good choice for utility-focused Subarus and overlanding builds.

why choose us

why choose our products
One-stop manufacturing of fundamental parts like vehicle sensors and engine injectors is the focus of our own production base. Ne can lower prices by more than 17% without having to pay a middleman. They can also respond to orders and make custom mass production within 30 days. They can also control every step of the process, from precision laser welding to strict quality inspection, to make sure that the quality meets OE standards. This helps customers around the world buy things without worrying about the cost.
Frequently Asked Questions
Q1. Will this fit my 2009 Subaru Forester 2.5L Turbo perfectly?
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Yes, this is a direct replacement for OEM part 16600-AA170 and works with all 2004–2012 Forester 2.5L Turbo (EJ255/EJ257) models.
Q2. Do I need specific equipment to put these gasoline injectors in?
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You only need a few basic tools (such a fuel line disconnect tool and a torque wrench). Comes with all the O-rings and cushions you need for easy installation.
Q3. Will they work with fuel rails or intake systems that aren't original equipment?
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Works with most aftermarket setups as long as they have OEM-style EV1 connection injectors.
Q4. Will this repair my P0171 and P0174 errors for lean fuel?
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Yes, for sure! These injectors, which have been carefully tuned, fix common problems with lean conditions in high-mileage Foresters.
Q5. Do these make my Forester get better gas mileage?
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The 4-hole nozzle's improved atomization compared to worn OEM injectors should give you 3–5% higher gas mileage.
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