Forester Fitment Explained
The abbreviated title suggests that this starter fits every 2003–2018 Forester with a 2.0L or 2.5L engine. The detailed application data is narrower.
Correct advertised Forester coverage is:
- 2003–2016 Forester 2.5L naturally aspirated with automatic transmission
- 2009–2013 Forester 2.5L turbocharged
- 2014–2018 Forester 2.0L turbocharged
Do not automatically list it for:
- 2017–2018 Forester 2.5L naturally aspirated
- Forester models with manual transmissions
- 2004–2008 Forester XT without catalog confirmation
- 2019-and-newer Forester
- Hybrid Forester models
- Engine- or transmission-swapped vehicles
The model-year range must be tied to the correct engine. Otherwise, “fits Forester 2003–2018” becomes less of a fitment statement and more of a creative-writing exercise.
Impreza Fitment
The starter is advertised for:
- 2004–2010 Subaru Impreza 2.5L with automatic transmission
- 2011 Subaru Impreza 2.5L with automatic transmission, excluding WRX-series models
Do not assume compatibility with:
- Manual-transmission Impreza
- 2011 WRX
- 2011 WRX STI
- 2.0-liter naturally aspirated Impreza
- 2012-and-newer Impreza
- Crosstrek
- Later WRX or WRX STI models
The WRX exclusion should remain prominent in the fitment table rather than being buried beneath the product description.
Legacy and Outback Fitment
Advertised coverage includes:
- 2005–2007 Legacy 2.5L with automatic transmission
- 2005–2007 Outback 2.5L with automatic transmission
- 2005–2007 Outback 3.0L H6
Legacy GT, Outback XT and manual-transmission compatibility should be confirmed separately. Turbocharged and naturally aspirated models can use different starter or transmission configurations even when the model year matches.
B9 Tribeca Fitment
The starter is listed for:
- 2006 Subaru B9 Tribeca 3.0L
- 2007 Subaru B9 Tribeca 3.0L
Do not extend the application to later 3.6-liter Tribeca models without a separate interchange listing.
Saab 9-2X Fitment
The Saab 9-2X shares substantial mechanical architecture with the Subaru Impreza, but the supplied application is limited to:
- 2005 Saab 9-2X 2.5L with automatic transmission
- 2006 Saab 9-2X 2.5L with automatic transmission
Do not automatically list the starter for:
- Saab 9-2X Aero turbo applications
- Manual-transmission Saab 9-2X
- Other Saab models
- Vehicles with a different original starter number
Shared Subaru ancestry helps, but a Saab badge does not perform the final interchange check for you.
Automatic-Transmission Warning
The supplied fitment repeatedly specifies automatic transmission for 2.5-liter applications. Starters for automatic and manual transmissions may differ in:
- Starter nose length
- Pinion position
- Ring-gear engagement
- Mounting flange
- Housing shape
- Electrical-terminal orientation
Do not publish universal transmission fitment. Confirm the transmission type before ordering.
OE and Interchange Numbers
The EZEXPREZE starter replaces or cross-references:
1784017840N1035330103-5330175261929223300AA57023300AA57223300AA57323300-AA57023300-AA57223300-AA573
The hyphenated and non-hyphenated Subaru numbers represent the same basic numbering formats. Match the complete OE number, including suffixes, whenever possible.
Confirm Physical Compatibility
Before ordering, compare the replacement starter with the original for:
- OE number
- Mounting-flange design
- Bolt-hole spacing
- Starter nose length
- Solenoid location
- Battery-terminal position
- Trigger-terminal design
- Nine-tooth pinion
- Pinion resting position
- Counterclockwise rotation
- Transmission type
- Bellhousing clearance
Engine displacement alone does not confirm starter compatibility.
1.4-kW Motor
The starter is rated at 1.4 kW and designed to provide the cranking output required for compatible Subaru four- and six-cylinder engines.
Starting performance also depends on:
- Battery charge level
- Battery cold-cranking capacity
- Positive-cable resistance
- Engine and chassis grounds
- Ambient temperature
- Oil viscosity
- Engine compression
- Starter-relay operation
A starter cannot draw power that never reaches it. Test the battery and cables before replacing the motor.
Nine-Tooth Drive
The starter uses a nine-tooth pinion. Correct tooth count and engagement depth are essential for reliable operation.
Incorrect fitment may produce:
- Grinding
- Starter spinning without engaging
- Intermittent engagement
- Ring-gear damage
- Starter kickback
- Delayed disengagement
- Abnormal cranking noise
Stop using the starter if grinding occurs after installation. Repeated attempts can turn a fitment problem into a flywheel replacement.
Diagnosing Starter Failure
Common starter-related symptoms include:
- Single click without engine rotation
- Multiple clicks during a start attempt
- Slow cranking with a tested battery
- Intermittent no-crank
- Starter spinning without engaging
- Grinding during engagement
- Electrical burning odor
- Starting only after repeated attempts
These symptoms may also be caused by:
- Weak or discharged battery
- Corroded battery terminals
- Damaged positive cable
- Poor engine ground
- Faulty starter relay
- Ignition-switch failure
- Park/Neutral safety-switch problem
- Immobilizer fault
- Damaged ring-gear teeth
- Internal engine damage
Perform proper electrical testing before ordering a starter. The parts cannon remains undefeated at replacing everything except the actual problem.
Battery and Voltage-Drop Testing
Before installation, check:
- Battery open-circuit voltage
- Battery load-test result
- Positive-cable voltage drop
- Negative-cable voltage drop
- Trigger-wire voltage
- Engine-to-body ground
- Battery-terminal condition
- Main fuse and starter relay
Excessive resistance can reduce starter voltage even when the battery appears healthy.
Installation Preparation
Before removing the original starter:
- Confirm the year, model and engine.
- Verify automatic or manual transmission.
- Record the original starter number.
- Disconnect the negative battery cable.
- Photograph the wire locations.
- Compare the new and old mounting flanges.
- Verify the nine-tooth drive.
- Check whether mounting hardware is included.
- Review the applicable service procedure.
The supplied description does not state that mounting bolts are included.
Installation Overview
A typical installation includes:
- Disconnecting the negative battery terminal.
- Raising and safely supporting the vehicle if required.
- Removing intake or underbody components that restrict access.
- Labeling the starter wires.
- Disconnecting the battery cable and trigger wire.
- Supporting the starter while removing its mounting bolts.
- Comparing the original and replacement units.
- Inspecting visible ring-gear teeth.
- Installing the EZEXPREZE starter.
- Torquing the mounting bolts correctly.
- Reconnecting the electrical terminals.
- Securing wiring away from exhaust components.
- Reinstalling removed parts.
- Reconnecting the battery.
- Testing starter engagement and disengagement.
Disconnect the battery before touching the starter cable. That wire is unfused, continuously powered and remarkably enthusiastic about welding tools to nearby metal.
Factory Certifications
EZEXPREZE states that its manufacturing facilities are certified under:
- ISO 9001
- IATF 16949
These certifications relate to quality-management systems used by the manufacturing organization. They do not independently certify that a particular starter will fit every vehicle named in a marketplace listing.
The company also states that each starter undergoes DV testing. Exact test procedures and results are not included in the supplied information.
One-Year Warranty
The starter is advertised with a one-year warranty and access to customer and engineering support.
Before purchasing, confirm:
- Warranty start date
- Proof-of-purchase requirements
- Labor coverage
- Return-shipping responsibility
- Diagnostic requirements
- Commercial-use exclusions
- Whether consequential damage is covered
Frequently Asked Questions
What vehicles does the EZEXPREZE 17840 starter fit?
It fits select Subaru Forester, Impreza, Legacy, Outback and B9 Tribeca models, plus the 2005–2006 Saab 9-2X, with the engines and transmissions listed above.
Does it fit every 2003–2018 Forester?
No. The exact engine and year combination matters. Naturally aspirated 2.5L fitment is listed for 2003–2016, while 2014–2018 fitment applies to the turbocharged 2.0L.
Does it fit manual-transmission models?
Manual-transmission fitment is not confirmed. Most 2.5L applications specifically require an automatic transmission.
Does it fit a 2011 Subaru WRX?
No. The supplied 2011 Impreza application specifically excludes WRX-series models.
Does it fit the WRX STI?
No confirmed WRX STI fitment is provided.
Does it fit a 2008 or newer 3.6L Tribeca?
No. The supplied Tribeca application covers only 2006–2007 models with the 3.0L engine.
Does it fit a Saab 9-2X Aero?
Aero compatibility is not confirmed. The listing specifies a 2.5L automatic-transmission application.
What are the starter specifications?
The starter operates at 12 volts, is rated at 1.4 kW and uses a nine-tooth pinion with counterclockwise rotation.
Which OE number should I match?
The primary Subaru number is 23300AA570, with 23300AA572 and 23300AA573 also included in the interchange.
Final Verdict
The EZEXPREZE 17840 provides a new replacement option for several Subaru automatic-transmission applications and the Subaru-based Saab 9-2X. Its 1.4-kW motor, nine-tooth pinion and Subaru OE interchange numbers provide the most useful confirmation points.
The headline fitment must be interpreted carefully. Confirm the engine, transmission and original starter number—especially on Forester turbo models, 2011 Impreza applications, the Saab 9-2X and any vehicle offered with both automatic and manual transmissions.
Visit My Pro Street for additional starter diagnostics, Subaru repair information and automotive electrical guides.
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