2014-2020 Acura RLX Engine Cover: A Guide to Gas vs. Sport Hybrid Models
Learn the crucial differences between the standard and Sport Hybrid engine covers and what to inspect before buying a used one.
- Two different engine covers exist for the 2014-2020 RLX and they are not interchangeable. Part 17121-R9P-A01 is for standard gas models and 17121-R9S-A01 is for Sport Hybrid models.
- The most common failure is broken mounting points, which causes a distinct rattling noise from the engine bay. Always inspect the tabs on a used part.
- Replacement is extremely easy and requires no tools, simply pulling the old cover off and snapping the new one on.
- The engine cover can hide other problems like oil leaks; it's wise to remove it for periodic inspections of the components underneath.
Critical: Standard vs. Sport Hybrid Engine Covers
The most important thing to know when buying an engine cover for a 2014-2020 Acura RLX is that there are two different versions, and they are not interchangeable. Your vehicle's powertrain determines which cover you need.
Warning: Failure to select the correct cover for your model will result in a part that does not fit. The mounting points and shape are different to accommodate the unique components of each powertrain.
- Standard Gasoline (FWD) Models: These vehicles use engine cover part number 17121-R9P-A01. This cover is designed for the standard 3.5L V6 engine.
- Sport Hybrid (SH-AWD) Models: These vehicles require engine cover part number 17121-R9S-A01. This cover has a different shape to fit the hybrid components in the engine bay. 🎬 Watch this road test to see the Sport Hybrid engine bay.
Always verify the part number or confirm the seller knows which model the used part came from before purchasing.
Symptoms of a Bad or Missing Engine Cover
Since the engine cover is not a moving part, its "failure" is typically related to physical damage. There are no diagnostic trouble codes (DTCs) associated with the engine cover.
- Rattling or Buzzing Noises: This is the most common symptom. It is almost always caused by broken or loose mounting points, or degraded rubber grommets that no longer hold the cover securely. The noise may be most noticeable at idle or at certain engine RPMs.
- Visible Damage: Cracks, melting, or warping can occur from excessive engine heat or from improper handling during maintenance.
- Hiding Other Issues: A missing or damaged cover can expose sensitive electronics to the elements. Conversely, an intact cover can hide other problems, such as oil or coolant leaks from the valve covers or other components beneath it. 🎬 Watch how to access components like valve covers under the engine cover. It's good practice to remove the cover for inspection periodically.
Buying a Used 2014-2020 RLX Engine Cover
Buying a used OEM engine cover is a great way to save money, as aftermarket options are rare and a new OEM part is expensive. Here’s what to check before you buy.
Step 1: Verify Compatibility
As mentioned, this is the most critical step. Confirm you are buying the correct part for your vehicle: 17121-R9P-A01 for the standard gas model or 17121-R9S-A01 for the Sport Hybrid. Do not assume they are interchangeable.
Step 2: Inspect All Mounting Points
The cover is held in place by several posts that pop into rubber grommets. Carefully inspect the areas on the underside of the cover where these grommets are seated. Look for cracks, broken plastic tabs, or any signs of stress. These are the most common failure points that lead to rattling. Also, ensure the rubber grommets themselves are present and in good condition, not dry-rotted or missing.
Step 3: Check for Physical Damage
Examine the entire surface of the cover for cracks, especially around the edges and any openings. Check the underside for any signs of melting or warping, which could indicate exposure to extreme heat from a previous engine problem. Minor scuffs and scratches are normal for a used part, but deep gouges or heat damage are red flags.
Installation and Replacement
Replacing the engine cover is one of the easiest tasks you can perform on your vehicle. No tools are required.
- Removal: Open the hood and locate the plastic engine cover in the center of the engine. Firmly grip the edges of the cover and pull straight up. It is held in place by several rubber grommets that will pop off their mounting posts.
- Installation: Position the new cover over the engine, aligning the grommets on the underside of the cover with the mounting posts on the engine. Press down firmly on the cover until you feel each grommet snap into place. 🎬 See a quick demonstration of removing and returning an engine cover.
Pro Tip: Before installing the new cover, make sure the rubber grommets are properly seated on the cover itself. Sometimes they can come off and remain on the engine's mounting posts during removal.
Known Issues, Recalls, and Service Bulletins
There are no recalls or technical service bulletins (TSBs) issued by Acura specifically for the engine cover on the 2014-2020 RLX. While there are several recalls for this vehicle, including for fuel pumps and suspension components, none pertain to the plastic engine cover. Some owners have noted rattling from the front suspension, which was addressed by TSB 14-040 for the front dampers, and should not be confused with a rattling engine cover.
Cost of a 2014-2020 Acura RLX Engine Cover
| Part Type | Estimated Cost |
|---|---|
| New OEM (Standard) | $375 - $390 |
| New OEM (Sport Hybrid) | $335 - $340 |
| New Aftermarket | Not Generally Available |
| Used OEM | $80 - $150 |
| Shop Labor | $0 - $25 (Often installed for free) |
Frequently Asked Questions (FAQ)
Is an engine cover really necessary?
While the car will run perfectly fine without it, the engine cover does provide benefits in noise reduction and protecting engine components from dust and debris. It is not a critical component for vehicle operation, but it is recommended to keep it in place.
How do I know if I have the standard or Sport Hybrid RLX?
The easiest way to tell is by the badging on the vehicle. Sport Hybrid models will have "SH-AWD" (Super Handling All-Wheel Drive) badges. Standard models are front-wheel drive (FWD). You can also check your vehicle's VIN or original sales documentation.
Can I fix a broken mounting tab on my old cover?
While it is sometimes possible to use high-strength epoxy or plastic welding techniques to repair a broken tab, it is often not a permanent solution due to engine vibration and heat. For a secure, rattle-free fit, replacement is the best option.
My engine is making a rattling noise. How do I know it's the cover?
A simple test is to remove the engine cover and drive the vehicle to see if the noise disappears. If the rattle is gone, you've found the culprit. If the noise persists, it could be something else, such as a loose heat shield or an internal engine issue that requires professional diagnosis.
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Technical Specifications
OEM Part Numbers: 17121-R9P-A01 17121-R9S-A01
Material: Plastic
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.
- Acura RLX:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Critical: Standard vs. Sport Hybrid Engine Covers
- Symptoms of a Bad or Missing Engine Cover
- Buying a Used 2014-2020 RLX Engine Cover
- Step 1: Verify Compatibility
- Step 2: Inspect All Mounting Points
- Step 3: Check for Physical Damage
- Installation and Replacement
- Known Issues, Recalls, and Service Bulletins
- Cost of a 2014-2020 Acura RLX Engine Cover
- Frequently Asked Questions (FAQ)
- 🎟️ Get 5% Off