2015-2021 Subaru WRX Engine Mounts: Solving the 2.0L vs. 2.5L STI Confusion
This guide clarifies the critical differences between engine mounts for the 2.0L WRX and the 2.5L WRX STI, helping you buy the right part the first time.
- The most critical issue is compatibility: 2015-2021 WRX (2.0L) and WRX STI (2.5L) use different, non-interchangeable engine mounts.
- The OEM part for the 2.0L WRX is likely 41022SG000, while the 2.5L STI uses 41022VA000. Always verify with a VIN.
- Symptoms of failure include severe vibration, clunking noises on acceleration, and visible engine movement.
- Replacement is a difficult, labor-intensive job (4-7 hours) that requires supporting the engine properly.
Symptoms of Failing Engine Mounts
A bad engine mount on a 2015-2021 Subaru WRX will make itself known through distinct sounds and vibrations. Because the WRX is a performance car, these symptoms are often more noticeable during spirited driving.
- Excessive Vibration: This is the most common symptom. You may feel an unusual amount of vibration in the steering wheel, seats, or throughout the cabin, especially at idle or when the air conditioning is on.
- Clunking or Thudding Noises: Loud clunks or bangs from the engine bay are a major red flag. These sounds are most common during sudden acceleration, deceleration, or when shifting gears. This is the sound of the engine moving too much and hitting other components.
- Engine Movement: With the hood open, have a helper briefly rev the engine while the car is in park or neutral with the parking brake on. If you see the engine lurch or rock excessively, the mounts are likely worn out. An engine should not move more than an inch or two.
- Jerky Performance: When you accelerate, the car might feel like it's lurching or jolting. This is because the worn mounts are allowing the engine to shift, creating a delay in power delivery to the wheels.
Known Issues and Recalls
As of early 2026, there are no specific recalls or Technical Service Bulletins (TSBs) from Subaru for engine mount failure on the 2015-2021 WRX. However, the mounts are considered a common wear item, especially on cars that are driven aggressively. The primary "issue" is the significant confusion between parts for the standard WRX and the WRX STI, which is detailed below.
Compatibility Warning: This is the single most important section of this guide. The engine mounts for the standard 2.0L WRX and the 2.5L WRX STI are NOT interchangeable. Many parts catalogs create confusion, but installing the wrong mount will not work.
- 2015-2021 WRX (2.0L FA20F Engine): The correct OEM part number appears to be 41022SG000. This applies to models with the 2.0L turbocharged engine.
- 2015-2021 WRX STI (2.5L EJ257 Engine): The correct OEM part number is 41022VA000. Do NOT order this part for a standard 2.0L WRX.
Always verify the part number with your vehicle's VIN (Vehicle Identification Number) with a dealer or trusted parts supplier before purchasing.
Buying a Used Engine Mount: What to Check
A used OEM engine mount from a low-mileage vehicle can be a great value, offering better ride quality and durability than a cheap aftermarket alternative. Here’s what to inspect before you buy:
- Check the Rubber Thoroughly: Look for any signs of cracking, tearing, or crumbling in the rubber portions of the mount. Pay close attention to the areas where the rubber is bonded to the metal.
- Look for Separation: Squeeze the mount and try to pull the metal and rubber components apart. There should be no give or signs of the rubber separating from the metal plates.
- Inspect for Leaks: Some OEM mounts are hydraulic (fluid-filled) to improve vibration damping. Look for any signs of oily residue or wetness on the mount's surface, which indicates the internal fluid has leaked out, and the mount is bad.
- Verify the Part Number: If possible, make sure the part number stamped on the mount matches what you need. Given the WRX vs. STI confusion, this is critical.
- Weight Comparison: As a general rule, genuine OEM mounts are often significantly heavier than their cheap aftermarket counterparts due to higher quality materials and construction. If a used mount feels unusually light, it may be a low-quality replacement.
Replacement Information
Replacing the engine mounts on a 2015-2021 WRX is an advanced job. The process is difficult due to tight spaces and the need to support the engine properly.
- Difficulty: 4.5 out of 5
- Estimated Time: 4-7 hours
- DIY Feasible: Yes, for experienced mechanics with the right tools. Not recommended for beginners. 🎬 Watch this step-by-step guide for installing mounts on a WRX.
The basic procedure involves supporting the engine with an engine support bar from above or a floor jack with a block of wood from below. Then, you unbolt the old mounts from the subframe and engine and maneuver them out. This can be very tight, and sometimes requires loosening exhaust components for clearance.
🎬 See how to navigate tight spaces during the installation process.Pro Tip: When installing the new mounts, do not fully tighten the bolts until the engine's weight is resting on them and all bolts have been started by hand. This ensures the engine is properly aligned and the mounts are not under tension. Torque the mount-to-crossmember nuts to 70 Nm (52 ft-lbs).
Cost Breakdown
Prices can vary by location and supplier, but this provides a general estimate for replacing a pair of engine mounts.
| Item | Estimated Cost |
|---|---|
| New OEM (Dealer) | $280 - $450 per mount |
| New Aftermarket | $65 - $150 per mount |
| Used OEM | $75 - $150 per pair |
| Shop Labor | $400 - $700 |
Frequently Asked Questions (FAQ)
Can I use STI engine mounts on my standard WRX?
No, the engine mounts for the 2.5L WRX STI (part number 41022VA000) will not fit the 2.0L WRX. You must use the mount specified for the 2.0L engine, which is typically 41022SG000.
Should I upgrade to stiffer aftermarket mounts?
It depends on your goals. Stiffer mounts, like polyurethane or "Group N" mounts, reduce engine movement and can improve throttle response and shifting feel. However, they will also transmit significantly more engine vibration and noise into the cabin, making the ride harsher. For a daily-driven car, OEM or used OEM mounts provide the best balance of performance and comfort.
🎬 Watch this comparison to see if upgraded mounts are worth it.Do I need to replace both mounts at the same time?
It is highly recommended. Engine mounts wear at a similar rate. If one has failed, the other is likely not far behind. Replacing them in pairs ensures proper engine alignment and saves you from having to do the same labor-intensive job twice.
Is an engine mount the same as a transmission mount?
No. While they perform a similar function, the engine mounts support the engine block, while a separate transmission mount supports the gearbox. A bad transmission mount can cause similar clunking and shifting issues. It's common to replace the engine mounts, transmission mount, and pitch stop mount at the same time for a complete drivetrain refresh.
Helpful Videos
Technical Specifications
OEM Part Numbers: 41022SG000 (For 2.0L WRX) 41022VA000 (For 2.5L WRX STI)
Torque Specs: Mount-to-Crossmember Nuts: 70 Nm (52 ft-lbs).
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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