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The legendary Mercedes-Benz M119 4.2L and 5.0L V8 engines found in the late-90s W140 S-Class, R129 SL500, and W210 E420 are celebrated for their buttery-smooth power delivery and bulletproof reliability. To achieve this refined performance, the ME engine management system relies entirely on the Mass Air Flow (MAF) Sensor—often referred to as the Hot-Film Air Mass Meter.
Mounted directly in the intake tract, this highly sensitive component continuously measures the exact volume, temperature, and density of the air entering your V8 engine. The engine computer uses this critical data to calculate the precise amount of fuel to inject and to manage transmission shift points. However, over decades of driving, the delicate heated film element inside the sensor becomes coated with microscopic dust particles and oily blow-by from the PCV system. When this element becomes insulated by dirt or burns out entirely, it sends skewed data to the computer, instantly throwing off the air-fuel mixture and causing a cascade of drivability issues.
Common Signs of a Failing M119 Mass Air Flow Sensor:
ASR/ESP Warning Lights: On late-90s Mercedes, a failing MAF often triggers the ASR (Acceleration Slip Regulation) or ESP light. The traction control system relies on engine load data from the MAF; when the data is erratic, the system disables itself and triggers a warning.
Check Engine Light & OBD-II Codes: A failing MAF will quickly trigger a Check Engine Light, typically accompanied by P0101 (Mass Air Flow Sensor Circuit Range/Performance) or codes indicating the short-term fuel trim is excessively rich or lean.
Rough Idle & Stalling: You may experience an erratic, bouncing idle, a severe stumble when pressing the gas pedal, or sudden stalling when coming to a stoplight.
Limp Mode & Harsh Shifting: If the computer receives irrational data from the MAF, it will drop the vehicle into a low-power "limp mode" and cause the automatic transmission to shift very harshly due to incorrect engine load calculations.
ECS Tuning Recommends for Classic V8 Owners: Do not install a brand-new MAF sensor without replacing your engine air filter! The most common cause of premature MAF failure is a dirty, clogged, or deteriorating air filter that allows debris to sandblast the delicate hot-film element.
Tech Tip: The sensitive measuring element inside the sensor is exposed. Never touch the internal wire/film with your fingers, as the natural oils from your skin will bake onto the element and destroy it the moment the engine is started. Ensure the entire airbox housing and intake boots are wiped completely clean before installing the new sensor.
Essential Tools & Hardware for the Job
Replacing the MAF sensor on your classic V8 is a very accessible DIY, but it requires extreme cleanliness and the right tools to easily navigate the large intake boots and clamps. We highly recommend adding these items to your ECS Tuning cart before starting the repair:
Mann-Filter or Genuine Mercedes-Benz Engine Air Filter: (CRITICAL) You must replace your engine air filter simultaneously to ensure clean, unrestricted airflow to your brand-new MAF sensor.
Schwaben Flexible Hose Clamp Driver (ECS Part #: ES#2975694): The MAF sensor on these engines is secured by large worm-gear hose clamps that can be incredibly frustrating to reach with a standard screwdriver. This flexible driver easily bends around the intake components to loosen and tighten clamps without stripping them.
CRC Mass Air Flow Sensor Cleaner (ECS Part #: ES#3035760): While your new sensor is perfectly clean, this is a great chemical to keep on the shelf for future 20,000-mile maintenance intervals to safely strip away oil and dust without damaging the sensitive plastics.
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This Part Fits the Following Vehicles
| Make | Model | Submodel | Engine | Year | Chasis | Special Fitment Notes |
|---|---|---|---|---|---|---|
| Mercedes Benz | 500SEC | Base | V8 5.0L | 1993 | 140.070 | Use vehicle selector to confirm fitment |
| Mercedes Benz | 500SEL | Base | V8 5.0L | 1992 | 140.051 | Use vehicle selector to confirm fitment |
| Mercedes Benz | 500SEL | Base | V8 5.0L | 1993 | 140.051 | Use vehicle selector to confirm fitment |
| Mercedes Benz | 500SL | Base | V8 5.0L | 1993 | 129.067 | Use vehicle selector to confirm fitment |
| Mercedes Benz | CL500 | Base | V8 5.0L | 1998 | 140.070 | Use vehicle selector to confirm fitment |
| Mercedes Benz | CL500 | Base | V8 5.0L 119.980 | 1999 | 140.070 | Use vehicle selector to confirm fitment |
| Mercedes Benz | E420 | Base | V8 4.2L | 1997 | 210.072 | Use vehicle selector to confirm fitment |
| Mercedes Benz | S420 | Base | V8 4.2L | 1996 | 140.043 | Use vehicle selector to confirm fitment |
| Mercedes Benz | S420 | Base | V8 4.2L | 1997 | 140.043 | Use vehicle selector to confirm fitment |
| Mercedes Benz | S420 | Base | V8 4.2L | 1998 | 140.043 | Use vehicle selector to confirm fitment |
| Mercedes Benz | S420 | Base | V8 4.2L 119.981 | 1999 | 140.043 | Use vehicle selector to confirm fitment |
| Mercedes Benz | S500 | Base | V8 5.0L | 1994 | 140.051 | Use vehicle selector to confirm fitment |
| Mercedes Benz | S500 | Base | V8 5.0L | 1995 | 140.051 | Use vehicle selector to confirm fitment |
| Mercedes Benz | S500 | Base | V8 5.0L 119.980 | 1996 | 140.051 | Use vehicle selector to confirm fitment |
| Mercedes Benz | S500 | Base | V8 5.0L 119.980 | 1996 | 140.070 | Use vehicle selector to confirm fitment |
| Mercedes Benz | S500 | Base | V8 5.0L 119.980 | 1997 | 140.051 | Use vehicle selector to confirm fitment |
| Mercedes Benz | S500 | Base | V8 5.0L 119.980 | 1997 | 140.070 | Use vehicle selector to confirm fitment |
| Mercedes Benz | S500 | Base | V8 5.0L 119.980 | 1998 | 140.051 | Use vehicle selector to confirm fitment |
| Mercedes Benz | S500 | Base | V8 5.0L 119.980 | 1999 | 140.051 | Use vehicle selector to confirm fitment |
| Mercedes Benz | SL500 | Base | V8 5.0L | 1994 | 129.067 | Use vehicle selector to confirm fitment |
| Mercedes Benz | SL500 | Base | V8 5.0L | 1995 | 129.067 | Use vehicle selector to confirm fitment |
| Mercedes Benz | SL500 | Base | V8 5.0L | 1996 | 129.067 | Use vehicle selector to confirm fitment |
| Mercedes Benz | SL500 | Base | V8 5.0L | 1997 | 129.067 | Use vehicle selector to confirm fitment |
| Mercedes Benz | SL500 | Base | V8 5.0L | 1998 | 129.067 | Use vehicle selector to confirm fitment |
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Any domestic orders that are returned to ECS Tuning as refused by receiver or non-deliverable will be subject to a return handling fee and will be processed as a return in compliance with our standard return policy, including a 15% restocking fee.
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Return Process
ECS Tuning now offers an online returns solution! To get started, simply log into your ECS Tuning account, Click the "View Orders" button on the My Account home page and select the order that you wish to make a return on to begin. If you have any questions, feel free to reach out to our Customer Service Team for assistance!
Please note: Refunds will be processed to the original payment method used on the order or to an in store credit, respective to the type of return that is made as well as any pre-existing arrangements with an ECS Tuning Customer Service Representative. In the event that multiple forms of payment were used, we will refund the value to an in store credit. In the event that a return label is provided, these charges may be deducted from the total refund you receive.
Original shipping costs are non-refundable and the buyer is responsible for return shipping charges. ECS Tuning will not accept COD deliveries.
All in store credit balances will expire after one year from the original purchase date.
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Free Shipping On Orders $49 & Up
Items marked with a 'Free Shipping On Orders $49 and Up' logo may qualify for free standard economy ground shipping to the contiguous United States (48 states) for most orders with a value greater or equal to $49.00 USD. Oversized products and direct ship products are excluded from this offer unless otherwise noted.
Free Shipping
Items marked as 'Free Shipping' may qualify for free standard economy ground shipping to the contiguous United States (48 states). Oversized products and direct ship products are excluded from this offer unless otherwise noted.
The policies listed above are subject to change at any time without notice.
Lifetime Replacement
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Why You Should Shop From ECS Tuning
ECS Tuning stands out as more than an automotive parts supplier-it's a vibrant community fueled by a shared passion for cars. Born from the enthusiasm of car lovers, we offer an unmatched understanding and commitment to the automotive world, providing high-quality parts and accessories sourced from our own experiences. Our selection is meticulously crafted to meet the highest standards of performance, quality, and design, catering to both the latest trends and classic styles.
Our distinct advantage lies in our passionate team and comprehensive support, offering expert advice and seamless service from selection to installation. Shopping with ECS brings exclusive perks, including our Lifetime Replacement Guarantee and free shipping on orders over $49, enhancing the value of every purchase. As a central hub for car enthusiasts, ECS Tuning fosters a rich community where ideas and experiences flourish, transforming us from a mere supplier into a platform where automotive dreams come to life.
Cancellation Policy
At ECS Tuning, we understand that plans can change. That's why we offer a flexible cancellation policy for our customers. You may cancel your order at any time before you receive the shipment confirmation. This policy is designed to provide you with peace of mind and the flexibility to make adjustments to your purchases as needed. Should you decide to cancel your order, simply reach out to our customer service team, and we will assist you with the process swiftly and efficiently.
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