MERCEDES 166-870-09-51 Left Power Tailgate Sensor Wrnty 173.MB1314 Benz 1YR

( Manufacturer Part Number: 166-870-09-51 ), ( Part Type: Sensor ), ( Conditions Options: Lh Power Tailgate Sensor ), ( Genuine Oem: Yes ), ( Ipn: 173.mb1314 ), ( Make: Mercedes-benz ), ( Descriptionpartcondition: 166 870 09 51 ), ( Manufacturer Warranty: 1 Year ), ( Partout Id: A-124442282 )

Review MERCEDES benz Left Power Tailgate Sensor Oem 1yr Wrnty 166 870 51 fits ML550 2009–2014

The **Mercedes-Benz 173.MB1314 Left Power Tailgate Sensor** is a precision-engineered component designed exclusively for the **2014 Mercedes-Benz ML550 (W166)**, ensuring seamless integration with the vehicle s advanced power tailgate system. This high-quality sensor is a critical part of the tailgate s electronic actuation mechanism, enabling smooth, keyless operation with a single touch of the remote or push-button start. Crafted to Mercedes-Benz s exacting standards, the sensor features a robust, corrosion-resistant construction, incorporating durable materials that withstand environmental exposure, including moisture, dust, and temperature fluctuations, which are common in diverse driving conditions. The unit is equipped with a **1-year warranty**, reflecting the manufacturer s confidence in its reliability and longevity, providing peace of mind for owners seeking long-term performance without frequent replacements.

This sensor operates in tandem with the ML550 s **keyless access and convenience system**, allowing for effortless tailgate opening and closing with minimal effort. Its precise magnetic or inductive sensing technology ensures accurate detection of the tailgate s position, preventing jams or misalignments that could otherwise lead to mechanical strain or operational failures. The **166 870 09 51** part number confirms its authenticity and compatibility, guaranteeing a perfect fit with the ML550 s factory-installed wiring harness and control module. Whether used for routine maintenance or as a direct replacement for a faulty original component, this sensor delivers the same level of sophistication and dependability that Mercedes-Benz drivers expect, maintaining the vehicle s premium functionality and aesthetic appeal. Ideal for both professional installers and discerning owners, it represents a straightforward yet essential upgrade for preserving the ML550 s refined driving experience.

### **Analysis of Buying a Mercedes-Benz ML550 (2014) with a Left Power Tailgate Sensor Issue (Part Number: 173.MB1314)**

#### **Overview of the Vehicle**

The **2014 Mercedes-Benz ML550** is a luxury mid-size SUV powered by a **5.5L V8 engine (M276)** producing around **408 hp** and paired with an **8-speed automatic transmission**. It belongs to the **ML-Class (W166)**, a model known for its comfort, refinement, and strong resale value. The **ML550** is the top-tier variant, offering premium features like **adaptive damping, advanced driver assistance systems, and a high-end interior**.

The **left power tailgate sensor (173.MB1314)** failure is a common issue in some **2013 2015 ML/W166 models**, particularly those with **left-hand drive (LHD)** configurations. The sensor controls the **electric tailgate**, and when it fails, the gate may not open or close properly, sometimes requiring manual intervention.

---

### **Pros of Buying This Vehicle**

1. **Strong Engine and Performance**

- The **5.5L V8** provides **plenty of power (408 hp)** and smooth acceleration, making it capable of handling highways and towing (up to **5,000 lbs** with the proper tow package).

- The **8-speed automatic transmission** offers smooth shifts, though some owners report **minor jerkiness** under heavy load.

2. **Luxury and Comfort**

- The **ML550** is equipped with **adaptive dampers**, **heated/ventilated seats**, and **premium sound systems**, ensuring a high level of comfort.

- The **interior is spacious**, with **seating for 5 7 passengers** (depending on configuration) and **high-quality materials** in the **AMG trim**.

3. **Reliability of the V8 Engine**

- The **M276 engine** is known for being **durable** if maintained properly. Many owners report **100,000 miles** with minimal issues beyond routine maintenance.

- Unlike some modern turbocharged engines, this naturally aspirated V8 is **less prone to turbo-related failures**.

4. **Strong Resale Value**

- Mercedes-Benz **ML-Class (W166)** retains its value well, especially the **AMG or high-end trims**.

- The **2014 model year** is not extremely rare, so parts and service are still widely available.

5. **Advanced Safety and Convenience Features**

- Standard **premium safety tech** includes **ESP, blind-spot monitoring, lane-keeping assist, and adaptive cruise control**.

- **Keyless entry, push-button start, and a high-quality infotainment system** (if equipped with **MBUX or COMAND system**) enhance convenience.

6. **Potential for Modifications**

- The **ML550 AMG** (if available) can be **tuned or modified** for better performance, though this requires expertise due to the vehicle s complexity.

7. **Good for Long-Distance Driving**

- The **smooth ride, powerful engine, and comfortable seating** make it ideal for **road trips and highway cruising**.

---

### **Cons of Buying This Vehicle**

1. **Tailgate Sensor Issue (173.MB1314)**

- The **left power tailgate sensor failure** is a **known problem** in some **2013 2015 ML/W166 models**, particularly those with **left-hand drive**.

- Tailgate **does not open/close automatically**.

- **Manual override may be required**.

- **Error codes (e.g., "Tailgate Sensor Fault")** may appear on the dashboard.

- The **sensor itself ( $100 $200)** is relatively inexpensive.

- **Labor ( $150 $300)** depends on the dealer or shop.

- **Wiring or connector issues** (if present) could increase costs.

- Some owners **disable the sensor** and use the **manual release**, but this may void certain warranty protections.

2. **High Maintenance and Repair Costs**

- Mercedes-Benz vehicles, especially luxury models, have **expensive maintenance and repair bills**.

- **Brake system (pads, rotors, calipers)** High wear due to heavy weight.

- **Suspension (shocks, struts, bushings)** Adaptive dampers can fail and are costly to replace.

- **Electrical gremlins** Infotainment glitches, sensor failures, and wiring issues are not uncommon.

- **Transmission fluid changes** Some owners report **transmission issues** if fluid isn t changed regularly ( $300 $600 for service).

3. **Fuel Economy Concerns**

- The **V8 engine is thirsty**, with **MPG ratings around 14 16 city / 18 20 highway**.

- **Gasoline prices** add up, especially for long commutes or highway driving.

4. **Complexity and Specialized Service Needs**

- Mercedes-Benz **diagnostic tools and software updates** require **authorized dealers**, increasing costs.

- **Independent mechanics may struggle** with some electrical or software-related issues.

5. **Potential for Hidden Issues**

- **Transmission fluid condition** (burnt smell or dark color indicates neglect).

- **Suspension wear** (uneven tire wear, clunking noises).

- **Brake system health** (thinning pads, warped rotors).

- **Electrical system** (test all sensors, infotainment, and driver aids).

- **Service records are crucial** A well-maintained ML550 will last longer, but a neglected one may have **hidden mechanical or electrical problems**.

6. **Depreciation and Insurance Costs**

- While the **ML550 retains value**, it is **not as depreciation-resistant** as some German rivals (e.g., BMW X5).

- **Insurance premiums** for a luxury SUV are **higher** than for a standard sedan or compact SUV.

7. **Tailgate Mechanism Reliability**

- The **electric tailgate** (common in W166 models) can be **prone to failures** beyond just the sensor.

- **Motor or wiring issues** may require **expensive repairs** ( $500 $1,000).

---

### **Conclusion and Recommendation**

#### **Should You Buy This Vehicle?**

**Yes, but with conditions.**

- **If the tailgate sensor issue is the only concern**, it is a **minor and repairable problem** ( $250 $500 total). Many owners **live with it** by using the manual release.

- **If the vehicle has been well-maintained** (oil changes, transmission service, brake/rotor replacements), it can be a **reliable and enjoyable luxury SUV**.

- **If you find a clean title, full service history, and a pre-purchase inspection (PPI) confirms no major issues**, the **ML550 is a great choice** for those who prioritize **power, comfort, and luxury**.

#### **Recommendations Before Purchase**

1. **Get a Professional Pre-Purchase Inspection (PPI)**

- **Transmission fluid condition**.

- **Suspension and steering components**.

- **Brake system (pads, rotors, calipers)**.

- **Electrical system (tailgate, sensors, infotainment)**.

- **Engine bay for leaks or wear**.

2. **Verify Service History**

- **Oil changes every 5,000 7,500 miles** (Mercedes recommends **7,500 miles** for synthetic).

- **Transmission fluid changes** (critical for longevity).

- **Brake and suspension work** (if not done, budget for it).

3. **Budget for Potential Repairs**

- **Tailgate sensor repair** ( $250 $500).

- **Suspension refresh** ( $1,000 $2,000 if needed).

- **Brake system overhaul** ( $800 $1,500).

- **Maintenance fund** ( $1,000 $2,000/year for upkeep).

4. **Consider Alternative Options**

- **ML550 with a manual tailgate** (if available).

- **BMW X5 (50i/55i)** Similar luxury, slightly better fuel economy.

- **Audi Q7 (3.0T)** Reliable V6 option with good resale.

- **Used ML550 AMG** (if you want more power and still need a luxury SUV).

5. **Negotiate

Details:

Please compare part numbers BEFORE purchasing. More Parts: 1 Year Warranty. Free shipping only applies to items you keep. Easy to find parts that don't require a mechanics knowledge.

Warranty HASSLE-FREE 1 YEAR WARRANTY: All parts are warrantied for a period of 12 months or year from the purchase date. Very happy customer, excellent value and service. Please disregard other fitment charts they may not be correct. Image shown may be the vehicle from which part was pulled, or a generic image representing typical stock, rather than unique item being sold.

Shipping Damage:: Damages and evidence of tampering on the outer packaging must be noted delivery receipt by driver. LEFT POWER TAILGATE SENSOR OEM 2014 MERCEDES-BENZ ML550 1YR WRNTY 166 870 09 51: LH 51 ; FROM: 2012 2015 4.6L Included: Hassle-free 1 Year Warranty Our Part #: 11328239. If something is wrong with an order, we certainly do want to help you. Model: ML550.

Quality, Assured Parts All are Quality Tested Inspected.

specifications trunklipa:

• for models: Ml550
• for makes: Mercedes
• for years: 2009-2014
• mpn: 166-870-09-51
• part type: Sensor
• conditions options: Lh Power Tailgate Sensor
• genuine oem: Yes
• ipn: 173.mb1314
• make: Mercedes-benz
• descriptionpartcondition: 166 870 09 51
• manufacturer warranty: 1 Year
• partout id: A-124442282

payments trunklipa:

• wallet: Apple-pay
• other
• credit card: Discover

seller trunklipa:

• rating: 97.3%
• # reviews: 23437
• city: Rancho Cordova, California

offer trunklipa:

• options: Ship-to-home
• quantity: 1
• best offers: True
• availability: In Stock
• sold: 0
• started: April 23, 2026

returns trunklipa:

• paid by: Buyer
• time: 60 Days
• policy: Returns Accepted

shipping trunklipa:

• type: Fixed
• cost: $30.00
• service: Flat Rate Freight
• class: Freight

general trunklipa:

• condition: Used
• Exterior Parts Accessories > doors, Trunk Lids Hatches > Hatches Trunk Lids

Mercedes 166-870-09-51 Is Similar To:

• 0019908258 Mercedes-benz Mercedes Oem 03-14 (31.3% similar) This part fits vehicles made in the following years 2007 , 2008 , 2009 , 2010 , 2011 , 2012 , 2013 , 2014 . This parts position is left, right...(January 4th, 2018)
• 0028210058 Mercedes Benz Oem Trunk Release Button (26.1% similar) 00-06 mercedes benz W220 S430 S500 oem trunk release button part number: may fit other years and model's please verify compatibility...(December 6th, 2018)
• 003-765-00 Hella Oem 81-85 Mercedes-benz (34.7% similar) Most orders are shipped USPS or fed ex. The handling charge includes packing labor and all extra material costs. This listing is for: one used trunk lid vacuum lock actuator removed from a 1982 mercedes benz 300SD...(January 29th, 2018)
• 0355455432 035 545 54 32 Mercedes Benz Wagon Trunk Lid Tailgate Hatch Module (30.8% similar) I am here to help, not steal your money...(July 2nd, 2018)
• 0aed957 Mercedes Benz Oem (24.8% similar) WDDGF77X49F200050 Hanoi. This parts came off an 2009 C63 with 69K...(April 23rd, 2018)
• 107 753 0158 Mercedes-benz Mercedes (33.1% similar) Photos of offer item: see above. Mercedes benz W107 SL rear trunk lid chrome emblem - star, complete. W186 a,b,c,d W180 - 220S se W120 ,190 W110 ,200,220B Sb Serb door W112 300SE W114 W107 350, 380, 450, 560 SL LC W116 450SE SLE this is in good cosmetic condition, no dents, major scratches or cracks...(December 31st, 2017)
• 1137500475 Mercedes Benz Lid (27.3% similar) Warranty on electronic devices is void if identifying mark removed or has sign of tampering. Items are sold as replacement not by color. Pictures may not be a correct indication of the item color due to lighting...(March 19th, 2018)
• 1177500085 Mercedes Oem Actuator Motor (23.9% similar) This part fits vehicles made in the following years 2014 , 2015 , 2016 , 2017 . This parts position is rear...(November 2nd, 2018)
• 1177500093 Mercedes-benz 2014-2017 Mercedes Benz (28.9% similar) Item may show signs of wear, light scuffs, scratches or other imperfections as a result this being used part...(February 13th, 2018)
• 1177500228 Mercedes Oem Trunk Right (24.5% similar) Est, Mon to Fri. All airbag modules are also non returnable...(March 6th, 2018)
• 1198110131 Mercedes Benz R129 300 (29.2% similar) My shipping prices are fair and accurate I do not charge for handling. I take pride in offering more and doing things different than others the business giving you other guys don't. I offer parts, service, diagnosis, and expertise for mercedes vehicles. The parts I can't test are believed to be in ...(February 16th, 2018)