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2012-2013 Mazda 3 Engine Cover: The SkyActiv vs. MZR Compatibility Guide

This guide explains the critical engine differences for the 2012-2013 Mazda 3 and how to ensure you buy the correct used engine cover.

6 minutes to read 2012-2013 Mazda MAZDA 3
Difficulty
1/5
Est. Time
0.1 hrs
DIY Doable?
✅ Yes
Shop Labor
$0
Used OEM Price
$75 - $150
✅ Safe to drive — Yes, the vehicle is perfectly safe to drive without an engine cover. It is primarily a cosmetic and noise-reducing part.
Key Takeaways
  • This cover ONLY fits the 2.0L SkyActiv engine; it will NOT fit the 2.0L MZR or 2.5L MZR engines also offered in 2012-2013.
  • Verify your engine by checking for a blue and black engine cover, blue-ringed headlights, or by trim level ('i Touring' or 'i Grand Touring').
  • When buying used, the most important check is for intact mounting posts on the underside of the cover.
  • Replacement is extremely easy, requiring no tools and taking less than a minute by simply pressing the cover into place.
The engine cover on the 2012-2013 Mazda 3 is a molded plastic or composite panel that sits on top of the engine. Its primary purpose is to reduce engine noise, vibration, and harshness (NVH) for a quieter cabin. It also serves as a cosmetic piece, providing a clean and organized look under the hood. Additionally, it helps protect the top of the engine and its components, like the ignition coils and fuel injectors, from dust, dirt, and minor debris. On SkyActiv models, the cover is often blue and black, serving as a visual identifier for the specific engine technology.

The Most Important Rule: SkyActiv vs. MZR Engine

Side-by-side comparison of the blue and black SkyActiv engine cover and the all-black MZR engine cover found in 2012-2013 Mazda 3 models.
The 2.0L SkyActiv engine cover (left) features a distinctive blue center section, while the older 2.0L MZR cover (right) is entirely black. They are not interchangeable.

Warning: This engine cover fits 2012-2013 Mazda 3 models with the 2.0L SkyActiv engine ONLY. For the 2012 model year, Mazda offered two different 2.0L engines: the newer SkyActiv and the older MZR. This part will not fit the 2.0L MZR or the larger 2.5L MZR engine. You must verify your vehicle's engine before ordering.

How to Identify Your Engine

Before purchasing an engine cover, you must confirm which engine is in the car. Using the wrong cover will result in it not fitting correctly, or at all. Here are several ways to tell the difference:

  • The Original Engine Cover: The easiest way to check is to look at the existing engine cover. The SkyActiv engine cover is distinctively blue and black and will say "SKYACTIV TECHNOLOGY" on it. The standard MZR engine cover is typically all black and says "DOHC 16-VALVE".
  • Headlights: Many SkyActiv models came with headlights that have a blue trim ring inside the lamp housing.
  • Trim Level: For the 2012-2013 model years in the US, the SkyActiv 2.0L engine was typically found in the 'i Touring' and 'i Grand Touring' trims. The base 'i Sport' trim usually had the 2.0L MZR engine.
  • VIN Number: The 8th digit of your Vehicle Identification Number (VIN) can identify the engine. While specific decoders vary, this is a reliable method that a dealership or auto parts store can use to confirm.

Symptoms of a Damaged or Missing Engine Cover

A plastic engine cover with a cracked edge and crumbling sound-deadening insulation on the underside.
Over time, heat cycles can cause the plastic to become brittle and crack, while the underside insulation pad may degrade and crumble into the engine bay.

Since the engine cover is not a moving part, its failures are related to physical condition rather than mechanical operation.

  • Increased Engine Noise: The most noticeable symptom will be an increase in engine sounds, like ticking from the injectors or valve train, inside the cabin. The cover includes a foam or fiber insulation pad on the underside specifically to dampen these noises.
  • Cracks or Breaks: The plastic can become brittle over time due to heat cycles and may crack, especially around the mounting points. This can cause rattling noises.
  • Deteriorated Insulation: The sound-deadening insulation on the underside can degrade, crumble, and fall into the engine bay. This can create a mess and may be a concern if the debris gets near moving belts.
  • Missing Cover: Often, covers are removed for service and not reinstalled. While the car will run perfectly fine without it, the engine bay will look unfinished and components are more exposed to dust.

Buying a Used 2012-2013 Mazda 3 SkyActiv Engine Cover

The underside of an engine cover showing the plastic mounting posts and the sound-deadening foam pad.
When buying a used cover, carefully inspect the underside mounting posts for cracks and ensure the sound-deadening pad is fully intact.

A used OEM engine cover is an excellent value, as it's a non-wear item. However, a careful inspection is still necessary to ensure you're getting a good part.

What to Inspect

  • Mounting Points: This is the most critical area. The cover is held on by several posts that push into rubber grommets on the engine. Carefully inspect each mounting post on the underside of the cover. Ensure they are not cracked, broken, or repaired with glue. A broken mount will cause the cover to vibrate and rattle.
  • Check for Cracks: Flex the cover slightly and inspect it for any hairline cracks, especially around the edges and oil filler cap opening. Pay close attention to any signs of stress from being removed or installed improperly.
  • Underside Insulation: Flip the cover over and check the condition of the sound-deadening pad. It should be fully intact and attached to the cover. If it's crumbling, flaking, or looks like a rodent has been nesting in it, you may want to find a better example or be prepared to remove the old insulation.
  • Heat Damage: Look for any signs of melting or warping. This is uncommon but could indicate the vehicle it came from had a severe overheating problem.

Cost of Replacing an Engine Cover

A person easily snapping a plastic engine cover into place over a Mazda engine.
Replacing an engine cover takes only seconds and requires no tools, meaning you should never have to pay shop labor for the installation.

Labor costs for this part are typically zero, as it's a simple part to install yourself or can be done in seconds during other service.

Part Type Estimated Cost
New OEM $185 - $262
New Aftermarket $35 - $60 (Note: These are typically for the lower splash shield, not the top cover)
Used OEM $75 - $150
Shop Labor $0 (Typically installed for free)

Installation Guide (Difficulty: 1/5)

Replacing the engine cover is one of the easiest tasks you can perform on your vehicle. It requires no tools and takes less than a minute.

  1. Align the Cover: Position the cover over the engine, aligning the opening for the oil filler cap and the mounting posts on the underside with the rubber grommets on the engine itself.
  2. Press to Secure: Once aligned, firmly press down on the corners of the cover. You should feel or hear the mounting posts snap into the grommets.
  3. Verify Fitment: Gently pull up on the edges of the cover to ensure it is securely attached and does not move or rattle.

Pro Tip: If the cover is difficult to install or remove, apply a small amount of silicone spray or rubber-safe lubricant to the rubber grommets on the engine. This will help the posts slide in and out more easily.

Known Issues, Recalls, and TSBs

There are no recalls or Technical Service Bulletins (TSBs) from Mazda specifically related to the plastic engine cover for the 2012-2013 Mazda 3. However, there are some related items to be aware of:

  • Liftgate Struts: A recall (NHTSA Campaign #16V644000) was issued for corroding liftgate support struts on 2010-2013 Mazda 3 hatchbacks, which could cause the rear hatch to fall unexpectedly. This does not affect the engine cover.
  • Rough Idle TSB: TSB 01-024/12 was issued for some 2012 SkyActiv models for rough idle and potential stalling, which required a PCM software update. This is unrelated to the physical engine cover.

Frequently Asked Questions (FAQ)

Is the engine cover necessary?

No, the vehicle will operate perfectly fine without the engine cover. Its main purpose is for noise reduction and aesthetics. However, it does offer minor protection from dust and debris for the components it covers.

Can I clean my engine cover?

Yes. You can remove it from the vehicle and clean it with a mild all-purpose cleaner and a cloth. Avoid using harsh chemicals or abrasive brushes that could damage the plastic finish or the lettering.

What if the mounting clips or grommets are broken?

The rubber grommets on the engine and the plastic mounting posts on the cover can wear out or break. The grommets are typically available as separate, inexpensive parts from the dealer. If the posts on the cover itself are broken, it's best to replace the entire cover, as a repair is unlikely to hold up to engine vibration and heat.

Why is the insulation under my engine cover falling apart?

The sound-deadening insulation can become brittle and disintegrate over time due to engine heat. In some cases, rodents may also chew on it to make nests. If the insulation is degrading, it can be scraped off. Some owners choose to replace it with self-adhesive, heat-resistant foam.

🎬 Watch: How to replace your engine cover's sound-deadening insulation.

Part Numbers and Specifications

Description Part Number
Engine Cover (2.0L SkyActiv) PE07-10-2F0B, PE07-10-2F0C
Engine Cover Mount (Grommet) PE07-10-238
Engine Cover Insulation Replacement MAZDA 3 6 CX-5 CX-9 CX-3 CX-7
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Engine Cover Insulation Replacement MAZDA 3 6 CX-5 CX-9 CX-3 CX-7

Technical Specifications

OEM Part Numbers: PE07-10-2F0B PE07-10-2F0C

Material: Molded Plastic/Composite. Color: Black with Blue accents. Attachment: Push-in posts into rubber grommets.

Wrenchy
Article researched & written by
Wrenchy
Go-Parts' AI research assistant. Every article is backed by live web research, verified OEM data, and real technician knowledge — so you get accurate, up-to-date information you can trust.
Meet Wrenchy → Updated May 25, 2026

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.

Year Coverage
This article covers the Engine Cover for:
  • Mazda MAZDA 3: 20122013
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