Subaru WRX Fuel Injector Replacement Cost in 2026
The WRX is a tuner-favourite turbocharged 4-cylinder with three meaningfully different fuel-system generations: the early EJ-series boxer with port injection (2002 to 2014), the FA20DIT direct-injection generation that brought injector reliability concerns (2015 to 2021), and the current FA24DIT (2022+). Cost varies by engine and the FA20DIT owners specifically should pay attention to documented failure patterns before authorising replacement.
FA20DIT full set (2015-21)
$800 - $1,400
4 DI injectors, 4 to 5 hrs labor
EJ255 full set (2008-14)
$600 - $1,000
port injection, ~3 hrs labor
FA24DIT full set (2022+)
$900 - $1,500
DI, latest generation
The FA20DIT Story: 2015 to 2021 WRX Owners Read This
When Subaru introduced the FA20DIT direct-injection turbocharged engine in the 2015 WRX, it was a clean-sheet move away from the long-running EJ-series. The new engine brought improved efficiency and a flatter torque curve. It also brought reliability concerns. Owner forums (NASIOC, /r/WRX, Subaru Forester Owners Network) and independent shop reports have documented patterns of direct-injection injector failure beginning at 60,000 to 100,000 miles.
The typical symptom progression: cold-start hesitation, then hard-warm-restart stumbles, then misfires under boost. Diagnostic codes commonly involve P0301 through P0304 (specific cylinder misfire) and sometimes P0087 (fuel rail pressure too low, which on FA20DIT can be either the injectors or the high-pressure pump).
Subaru has issued several TSBs related to FA20DIT fuel-system reliability and at least one extended warranty action covering high-pressure fuel system components on early FA20DIT cars. Check your VIN through the Subaru owner portal and the NHTSA recalls portal before authorising paid work. An open warranty action could mean dealer-covered replacement.
The EJ-Series WRX: Port Injection Days
From 2002 to 2014, the WRX used variants of the EJ20 and EJ25 boxer turbocharged engines (EJ20T, EJ255, EJ257 in STI form). All were port injection at 50 to 60 PSI. Parts are inexpensive: $80 to $130 per injector at OEM Subaru pricing, less at aftermarket. Hitachi and Bosch are the primary OEM suppliers.
The horizontally opposed (boxer) engine layout creates one specific complication: cylinder access is from the side rather than the top. Removing the fuel rail requires disconnecting plumbing on both banks. Mitchell ProDemand lists 2.8 to 3.2 hours of labor for the full set. An independent shop full set is $620 to $900. A Subaru dealer is $800 to $1,100.
EJ-series injectors are highly reliable; they regularly last 150,000+ miles. When replacement is needed it is usually clog-related and a cleaning attempt should precede replacement.
Why Single-Injector Replacement on a Turbo Subaru is Risky
Subaru ships WRX injectors flow-matched in sets of four. Flow rate per injector varies by 3 to 5% from spec, and the factory matches sets so that all four are within plus or minus 1% of each other. Replacing one injector with an off-the-shelf part can shift that cylinder's fuel trim by 3 to 5% relative to the others.
On a naturally aspirated engine that mismatch is uncomfortable but rarely dangerous. On a turbocharged engine running 15+ PSI of boost, that mismatch can push one cylinder slightly lean under high-load conditions, which is the precise condition for detonation and ring-land damage. The community consensus across NASIOC and tuner forums is: always replace WRX injectors as a matched set.
Some specialist shops can flow-match a new replacement injector to an existing set using ultrasonic cleaning and flow-bench testing, which costs $150 to $300 but preserves the matched-set requirement. For DIY-minded owners, this is a viable middle ground.
E85 and Upgraded Injectors
A meaningful portion of the WRX owner base runs E85 for higher octane and cooler charge temperatures. E85 has roughly 30% less energy density than 91 octane gasoline, which means injectors need to flow about 40% more fuel for the same engine output. Stock WRX injectors (565cc on EJ255, 605cc on FA20DIT) maxes out at roughly 95% duty cycle on full boost with E85, which is unsafe.
Common upgrade paths: 1,050cc injectors from Injector Dynamics ($720 to $850 for a set), 1,000cc from Fuel Injector Clinic ($680 to $780), or 1,200cc from DeatschWerks ($580 to $720). All require ECU re-tuning afterward ($400 to $700 at a tuning shop). This is not a stock-replacement scenario but is worth knowing about for WRX-specific cost planning.
Cost Saving Strategies on a WRX
On EJ-series cars, fuel-system cleaner ($10 to $15) is still worth trying before replacement. EJ injectors respond well to additives and even occasional ultrasonic cleaning ($50 to $100). On FA20DIT cars, fuel-tank additives have limited reach into the injector tip because direct injection bypasses the intake valves.
For FA20DIT owners, the highest-yield cost-saving step is checking for active extended-warranty coverage. Subaru has covered fuel-system components on a meaningful percentage of FA20DIT WRXs at no charge to the owner, even out of standard powertrain warranty.
Find a Subaru-specialist independent rather than going to a Subaru dealer where possible. Specialists typically charge $110 to $150 per hour versus dealer rates of $160 to $200, and they know the FA20DIT failure modes well. See the full save money guide.