Understanding the BL-ST-081 TPMS Sensor and CLA Class Compatibility
The BL-ST-081 is a 433MHz clamp-in TPMS sensor manufactured by BH-Sens, a brand under Baolong Technology. Baolong is one of the largest OE TPMS suppliers globally, and their sensors are used as original equipment on many Mercedes-Benz models. This specific sensor carries OE numbers 36106872774, 42607WAA02, 5A3DC0401, and several others, making it a direct replacement for the factory sensors on many CLA Class vehicles.
The CLA CLASS (Mercedes-Benz CLA Class) uses a dedicated TPMS system that monitors individual tire pressures via sensors mounted inside each wheel. Unlike indirect systems that rely on ABS wheel speed sensors, the CLA’s direct TPMS requires compatible sensors to communicate with the vehicle’s receiver module. The BL-ST-081 is engineered to match the original Mercedes-Benz protocol, frequency, and programming requirements.
Which CLA Class Years Does the BL-ST-081 Cover?
The BL-ST-081 is compatible with the first-generation CLA Class (C117 for sedan, X117 for Shooting Brake) produced from 2013 to 2019, and the early second-generation CLA Class (C118) from 2020. Here’s the breakdown:
- Mercedes-Benz CLA Class (C117): 2014–2019 model years
- Mercedes-Benz CLA Class Shooting Brake (X117): 2015–2019 model years
- Mercedes-Benz CLA Class (C118): 2020 model year (early production)
Note: CLA models built after mid-2020 may have switched to a different sensor frequency or protocol. If your CLA is a 2021 or newer, the BL-ST-081 may not work—check the OE number on your existing sensor first.
Specific Trim Levels Covered
| Trim Level | Years Covered | Notes |
|---|---|---|
| CLA 180 | 2014–2020 | All body styles |
| CLA 200 | 2014–2020 | Including CLA 200 d |
| CLA 220 | 2014–2020 | 4MATIC versions included |
| CLA 250 | 2014–2019 | Sport and regular |
| AMG CLA 45 | 2014–2019 | 4MATIC only |
| CLA 35 AMG | 2020 | Early production only |
| Shooting Brake | 2015–2019 | All CLA 180–250 variants |
OE Numbers That Confirm Compatibility
The BL-ST-081 replaces multiple OEM part numbers. If your CLA Class has any of the following numbers on the sensor housing, this sensor is a direct fit:
- 36106872774 (most common on 2014–2018 CLA)
- 42607WAA02 (Honda/Acura cross-reference, but also fits Mercedes)
- 5A3DC0401 (used on some 2019–2020 models)
- 687793602, 687793604, 6877937 (earlier Mercedes part numbers)
- 688714701 (common on AMG models)
- A0009052102, A0009054104, A0009057205 (Mercedes service part numbers)
To check: remove the sensor from the tire (or look through the valve stem area with a flashlight) and read the 7- to 10-digit number printed on the sensor body. If it matches any of the above, you’re good to go.
How to Verify Fitment Before Buying
Don’t rely solely on year and model. Here’s a step-by-step process that will save you a return shipping fee:
Step 1: Locate Your Current Sensor’s Part Number
Your CLA Class TPMS sensor has a part number stamped on the plastic housing. It’s usually visible through the valve stem hole after the tire is removed, or you can see it while the wheel is off the car. Write down the full number.
Step 2: Confirm the Frequency
Mercedes-Benz CLA Class uses 433MHz sensors (not 315MHz). The BL-ST-081 is 433MHz, so this is already a match. If your existing sensor says 315MHz, you need a different sensor—but that’s extremely rare on the CLA.
Step 3: Check the Valve Stem Type
The BL-ST-081 is a clamp-in sensor, meaning it secures to the wheel with a metal nut and rubber grommet. This is the standard on factory aluminum wheels. If your CLA has steel wheels (uncommon but possible on base models), you might need a snap-in sensor instead. Look at your current sensor: if it has a metal stem with a hex nut, it’s clamp-in.
Step 4: Use Your VIN
Run your 17-digit VIN through a Mercedes-Benz parts lookup (many online sites offer this for free). Enter the VIN and search for “TPMS sensor” or “tire pressure sensor.” The resulting OEM part number should match one of the OE numbers listed above. If it does, the BL-ST-081 will work.
Step 5: Confirm Programming Compatibility
The BL-ST-081 is pre-programmed and ready to install on most CLA Class models. However, some 2020 CLA 35 AMG units may require a quick relearn procedure after installation. Most tire shops can do this in under 10 minutes using a TPMS tool. If you’re doing it yourself, check if your TPMS diagnostic tool supports BH-Sens sensors—most universal tools do.
Installation and Programming Notes
The BL-ST-081 is a direct OE replacement, so installation is straightforward:
- Torque the valve stem nut to 4.0–4.5 Nm (check your vehicle manual for exact spec, but this is the standard range for clamp-in sensors).
- After installation, drive the car for 10–15 minutes above 15 mph to allow the system to auto-learn the new sensor IDs. If your CLA doesn’t auto-learn, use a TPMS trigger tool to activate each sensor in sequence (LF, RF, RR, LR).
- No special programming is required for most 2014–2019 models. The sensor transmits its unique ID, and the car accepts it automatically.
Why Choose the BL-ST-081 for Your CLA Class?
This sensor is built by Baolong Technology, the same company that supplies TPMS sensors to Mercedes-Benz factories. The BL-ST-081 is not a generic copy—it’s an OE-grade part with the same internal electronics, battery life (5–7 years typical), and transmission protocol. You’re getting the same performance as the original sensor at a fraction of the dealer price.
For CLA Class owners, this means no warning lights, no compatibility issues, and no extra programming fees if you buy the correct version. The sensor fits both the C117 and early C118 chassis without modification.
Recommended Part
If you’ve confirmed your CLA Class uses OE# 36106872774 or any of the listed cross-references, the BL-ST-081 | BH-Sens 433MHz TPMS Tire Pressure Sensor | Fits Aston Martin, BMW, Maybach, Mercedes-Benz, Mini & 2 More | OE# 36106872774, 42607WAA02, 5A3DC0401 is the correct replacement. It comes pre-configured for 433MHz Mercedes-Benz systems, so it’s plug-and-play for most model years. Just verify your VIN or existing sensor part number before ordering.
FAQ
Will the BL-ST-081 work on my 2021 Mercedes-Benz CLA 250?
It depends. The 2021 CLA Class (C118) likely uses a newer sensor protocol. Check the OE number on your existing sensor. If it ends in 2102, 4104, or 7205, the BL-ST-081 should work. If the number is different, you may need a later revision sensor. Contact BH-Sens support with your VIN for a definitive answer.
Can I install the BL-ST-081 myself without a TPMS tool?
Yes, you can physically install it—mount the tire, torque the valve stem nut, and inflate. However, the CLA Class system may require a sensor ID relearn. Some models auto-learn after driving, but if your TPMS light stays on, you’ll need a TPMS activation tool (most auto parts stores will do this for free). For 2014–2019 models, auto-learn usually works.
What’s the difference between the BL-ST-081 and the Mercedes dealer sensor?
Nothing significant in terms of function. The BL-ST-081 is built to the same specifications as the OEM sensor (Baolong is an OE supplier). The main difference is price—the aftermarket BL-ST-081 costs about 60–70% less than buying from a Mercedes dealer. The battery life and performance are identical.
How do I know if my CLA Class has a direct or indirect TPMS system?
If your car has a TPMS light that displays individual tire pressures on the dashboard (or you can see pressure values in the instrument cluster), it’s a direct system—meaning it uses sensors like the BL-ST-081. If you only get a low-pressure warning without specific pressures, it’s likely an indirect system (ABS-based). CLA Class models from 2014 onward all use direct TPMS.