
A1666821200 Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $49.99 | Condition is Used, 2012-2014 MERCEDES ML350 W166 REAR LEFT SIDE EXHAUST PIPE HEAT SHIELD PLATE OEM, FREE SHIPPING | ![]() |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $142.55 | Condition is Neu, NEW MERCEDES BENZ SHIELD A1666821200 OEM, shipping cost = $53.48 | 99.1% |
![]() | $151.53 | Top Pick! Condition is Neu, NEW MB SHIELD A1666821200 OEM, shipping cost = $52.31 | 99.2% |
![]() | $174.47 | Top Pick! Condition is Neu, OEM MERCEDES M GL-CLASS REAR LEFT CATALYTIC CONVERTER HEAT SHIELD A1666821200, shipping cost = $34.88 | 97.3% |

The Mercedes-Benz ML350 W166 (2012-2014) Rear Left Exhaust Pipe Heat Shield Plate, with the part number A166 68 21 12, is a crucial component designed to protect the exhaust system from external heat and environmental elements. This heat shield plate is specifically engineered for the ML350 model's rear left exhaust pipe.
Made from high-quality materials, this heat shield plate effectively insulates the exhaust pipe from the vehicle's interior, maintaining a comfortable cabin temperature. It also acts as a barrier between the exhaust system and the undercarriage of the vehicle, preventing potential damage from road debris and other hazards.
The design of this heat shield plate is meticulously crafted to fit seamlessly with the ML350's exhaust system. Its contoured shape allows for a precise fit, ensuring optimal performance and efficiency. The shield plate is also coated with a durable, heat-resistant finish that enhances its durability and ability to withstand the extreme temperatures generated by the exhaust system.
Installing this heat shield plate is a straightforward process, making it an excellent choice for DIY enthusiasts or those who prefer to save on labor costs. It comes with all necessary mounting hardware, making the installation process hassle-free. Additionally, its OEM (Original Equipment Manufacturer) quality ensures that it meets the same rigorous standards as the parts originally installed on your Mercedes-Benz ML350.
In summary, this Mercedes-Benz ML350 W166 (2012-2014) Rear Left Exhaust Pipe Heat Shield Plate (A166 68 21 12) is an essential component for maintaining the optimal performance, efficiency, and durability of your vehicle's exhaust system. By insulating the exhaust pipe and protecting it from external elements, this heat shield plate not only enhances your driving experience but also contributes to the overall longevity of your Mercedes-Benz ML350.
Buying a Mercedes-Benz ML350 (W166) rear left exhaust pipe heat shield plate can be a necessary repair for those experiencing exhaust system issues. Here are some potential pros and cons to consider before making a purchase.
Pros:1. Improved Functionality: A damaged or missing heat shield plate can allow excessive heat to come into contact with other components, potentially causing further damage. Replacing the heat shield plate can help prevent these issues and improve the overall functionality of the exhaust system.
2. Enhanced Comfort: A faulty heat shield plate can also result in unwanted heat entering the cabin, making the driving experience less comfortable. Replacing the heat shield plate can help reduce cabin heat and improve overall comfort.
3. Long-Term Savings: Neglecting exhaust system issues can lead to more extensive and expensive repairs down the line. By addressing the issue with a new heat shield plate, you may be able to save money in the long run.
Cons:1. Cost: Replacing a heat shield plate can be an expensive repair, especially for luxury vehicle brands like Mercedes-Benz. The cost of the part itself, as well as the labor costs associated with installation, can add up.
2. Availability: Depending on the specific model year and availability of the part, it may take some time to source and receive the heat shield plate. This could result in additional downtime for your vehicle.
3. Installation Complexity: Installing the heat shield plate may require specialized tools and expertise, which could add to the overall cost and complexity of the repair.
In conclusion, while replacing the Mercedes-Benz ML350 (W166) rear left exhaust pipe heat shield plate can help improve the functionality, comfort, and potentially save long-term costs, it also comes with some drawbacks, such as cost, availability, and installation complexity. Ultimately, the decision to replace the heat shield plate should be based on the individual's specific circumstances, including the severity of the issue, the vehicle's value, and personal budget considerations.
If you are experiencing issues with your Mercedes-Benz ML350 exhaust system and are considering a heat shield plate replacement, it may be worth getting a quote from a trusted repair shop to assess the extent of the damage and the associated costs. This can help you make an informed decision and ensure that your vehicle is running safely and efficiently.
Details:
Drive type: all wheel AWD / 4 mastic. Transmission: 7-speed automatic 7g-tonic. Mileage: 149k miles. Body type: sport utility 4-door SUV.
specifications heatnshield:
- for models: Ml350, W166
- for years: 2012–2014
- brand: Mercedes
- mpn: A1666821200
- vintage part: No
- type: Heat Shield
- placement on vehicle: Rear, Left
- country/region of manufacture: United States
- color: Silver
payments heatnshield:
- wallet: paypal
- other
- credit card: diners-club
seller heatnshield:
- city: kingsley, michigan
- # reviews: 16558
- rating: 99.4%
general heatnshield:
- category: Auto Parts > Car Truck Accessories > Exhaust Emission Systems > Heat Shields, Wraps Sleeves
offer heatnshield:
- availability: in stock
- sold #: 18
- prices: $142.55–$174.47
- item condition:
- Used
- Neu
- best offers: true
- in stock #: 4
- started: september 18, 2025
- options: ship-to-home
returns heatnshield:
- time: 30 days
- paid by: buyer
- policy: returns accepted
shipping heatnshield:
- class: standard
- type: fixed
- transit: 4-7 days
- service: standard
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