McLaren 570S, 650S, MP4-12C & More: Engine Air Intake Resonator Guide
This guide covers the common failures, symptoms, and replacement costs for the engine air intake resonator on McLaren models sharing the 3.8L twin-turbo V8.
- The most common failure is cracking due to heat and age, causing a vacuum leak.
- Symptoms include a whistling noise, rough idle, reduced power, and a Check Engine Light with lean codes (P0171, P0174).
- When buying a used part, carefully inspect for hairline cracks and verify the OEM part number matches your original part exactly.
- This part is shared across the MP4-12C, 650S, 540C, 570S, 570GT, and 600LT, but left and right side parts are different and have unique part numbers.
Symptoms of a Failing Air Intake Resonator
A failure in the air intake resonator, which is typically a crack or leak, allows unmetered air to enter the engine after the mass airflow sensor. This can lead to a variety of noticeable issues.
- Whistling or Hissing Noises: A high-pitched whistle or a sucking sound from the engine bay, especially under acceleration, is a classic sign of an intake leak.
- Rough Idle: The engine may idle erratically or hunt for a stable RPM because the unmetered air is disrupting the carefully balanced air-fuel ratio.
- Check Engine Light: A significant air leak will often trigger a Check Engine Light. The most common trouble codes are P0171 (System Too Lean Bank 1) and P0174 (System Too Lean Bank 2), indicating 🎬 Watch: How to diagnose lean codes P0171 and P0174 that the oxygen sensors are detecting too much air in the exhaust.
- Reduced Engine Performance: You may notice hesitation during acceleration or a general loss of power. The engine control unit (ECU) may struggle to adapt to the inconsistent airflow, affecting performance.
Known Issues and Vehicle-Specific Information
The air intake resonators on these McLaren models are made of plastic and are susceptible to cracking from years of heat cycles and engine vibration. The issue is common across all vehicles built on this platform, as they share the same fundamental 3.8L twin-turbo V8 engine architecture.
- 2012-2014 McLaren MP4-12C: As the earliest models with this platform, they are highly susceptible to age-related plastic brittleness.
- 2014-2017 McLaren 650S: Similar to the MP4-12C, these vehicles experience failures due to heat and age.
- 2016-2021 McLaren 540C, 570S, and 570GT: These models use a similar intake design and are prone to the same cracking issues.
- 2018-2021 McLaren 600LT: While a more track-focused model, the 600LT still uses the same basic intake plumbing and is not immune to these failures.
There are no specific recalls or Technical Service Bulletins (TSBs) from McLaren or the NHTSA related to the engine air intake resonators for these models. Recalls for these vehicles typically focus on more critical safety systems like airbags or brakes.
Buying a Used Engine Air Intake Resonator
Given the high cost of new OEM parts for McLaren vehicles, a used resonator is an excellent value. However, careful inspection is critical to ensure you're getting a good part.
- Why Used OEM is a Good Choice: The original McLaren parts are designed for perfect fitment and acoustic properties. Aftermarket options are virtually nonexistent for this specific component, making a quality used OEM part the best alternative to a new one.
- Thorough Visual Inspection: Carefully examine the entire part for hairline cracks, especially around the seams, mounting tabs, and connection points for hoses. An eBay listing for a used part noted a broken plastic nipple fitting, which is a common failure point to check.
- Check for Brittleness: Gently flex the plastic. It should have some give; if it feels excessively hard or brittle, it may be prone to cracking soon after installation.
- Verify Part Numbers: McLaren uses several part numbers for left and right side ducts across these models. It is absolutely essential to match the part number from your old part to the used one you are purchasing. For example, part number 11F0238CP is a right-side duct, while 13F0298CP is a left-side hose.
- Ask About the Donor Vehicle: If possible, find out the mileage and condition of the car the part came from. A part from a lower-mileage, well-maintained vehicle is always preferable.
Cost Comparison
Replacing an air intake resonator on a McLaren can be expensive, primarily due to the high cost of the part itself and the specialized labor involved.
| Part/Service | Estimated Cost |
|---|---|
| New OEM Part | $400 - $800+ per side |
| New Aftermarket Part | Not Generally Available |
| Used OEM Part | $100 - $300 per side |
| Shop Labor | $300 - $600 |
Pro Tip: Labor costs can vary significantly. Accessing the resonators requires removing engine bay panels, and the process can be time-consuming. An independent specialist in European performance cars may offer more competitive labor rates than a McLaren dealership.
OEM Part Numbers
This list contains known part numbers for the air intake system on these vehicles. Always confirm the correct part number for your specific vehicle's VIN before ordering.
- 11F0238CP (Right Side Duct)
- 11F0246CP (Left Side Duct)
- 11F0943CP (Left Side Upper Tube)
- 11F0944CP
- 13F0298CP (Left Side Hose, Intercooler to Throttle Body)
- 13F0300CP (Left Side Hose, Turbo to Intercooler)
- 13F0681CP (Left Side Duct)
- 13F0683CP
Frequently Asked Questions
Can I drive my McLaren with a cracked air intake resonator?
Yes, but it is not recommended for an extended period. The car will likely run poorly, with a rough idle and reduced performance. A persistent lean air-fuel mixture can, over time, lead to increased engine temperatures and potential damage to internal components like pistons and valves.
Is replacing an intake resonator a DIY job?
For an experienced DIY mechanic, this is a manageable task. However, working on a mid-engine McLaren can be challenging due to tight spaces. It requires removing several engine covers and carefully disconnecting sensors and clamps. If you are not comfortable working in a cramped engine bay, it's best to leave this job to a professional.
Will an aftermarket carbon fiber intake improve performance?
Many companies offer carbon fiber replacements for the engine intake covers and ducting. While they may offer a slight performance benefit by providing a smoother path for air, their primary benefit is aesthetic. A stock resonator that is in good condition will not significantly restrict performance for a stock or lightly modified engine.
🎬 Watch: How to upgrade your McLaren air intakeHow do I find the air leak to confirm the resonator is bad?
The most effective method is a smoke test. A technician injects harmless, pressurized smoke into the intake system with the engine off. The smoke will escape from any cracks or leaks, making them easy to pinpoint visually. A simple visual inspection with a bright light may also reveal obvious cracks.
Helpful Videos
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Technical Specifications
OEM Part Numbers: 11F0238CP 11F0246CP 11F0943CP 11F0944CP 13F0298CP 13F0300CP 13F0681CP 13F0683CP
Material: Molded 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.
- McLaren 570S:
- McLaren 600LT:
- McLaren 570GT:
- McLaren 540C:
- McLaren 650S:
- MCLAREN MP4-12C: