Frequency Band: Why 433MHz Matters for Your GLS CLASS
The BL-ST-037 operates at 433MHz, which is the standard TPMS frequency used in most European and Asian vehicles, including the GLS CLASS. Unlike the 315MHz band common in North American vehicles, 433MHz offers better signal penetration through metal chassis components and tire rubber, especially at highway speeds. This frequency is less prone to interference from aftermarket electronics like dash cams or radar detectors.
The sensor transmits tire pressure and temperature data every 60 seconds when the vehicle is moving above 25 km/h. If your GLS CLASS was originally equipped with 315MHz sensors, you cannot mix frequencies — the receiver module in your car is tuned to one band only. Always verify your existing sensor frequency before ordering.
Battery Life and Replacement Cycle
The BL-ST-037 uses a sealed CR2032 lithium coin cell. Under normal driving conditions (15,000–20,000 km/year), expect a battery life of 5–7 years. Factors that shorten battery life include:
- Frequent short trips (sensor wakes and sleeps many times)
- Extreme temperatures (below -20°C or above 85°C)
- Low tire pressure triggering more frequent transmissions
Once the battery depletes, the entire sensor must be replaced — the battery is not serviceable. The sensor will trigger a low-battery warning on your dashboard approximately 1–2 months before failure, giving you time to schedule replacement. For a GLS CLASS, you should replace all four sensors simultaneously to avoid staggered failures.
IP Rating: What IP67 Means for TPMS Sensors
The BL-ST-037 carries an IP67 ingress protection rating. This is the industry standard for automotive TPMS sensors:
- IP6 = Dust-tight. No dust ingress even in heavy off-road conditions.
- IP7 = Protected against immersion in 1 meter of water for 30 minutes.
This rating ensures the sensor survives rain, car washes, puddles, and even brief submersion. However, IP67 does not guarantee protection against high-pressure washers aimed directly at the valve stem for extended periods. For your GLS CLASS, the sensor is mounted inside the tire, so the main exposure risk is during tire mounting or when driving through deep water.
Protocol Compatibility: Pre-Programmed vs. Cloneable
The BL-ST-037 is pre-programmed to match the exact communication protocol of vehicles using OE numbers 4275333W and ZQ01162780. This means:
- No programming tool required — install and drive.
- The sensor ID is already set to a range that your GLS CLASS receiver will recognize after a short pairing drive (typically 5–10 minutes above 40 km/h).
Compatible protocol types include:
- Direct TPMS (measures actual pressure inside the tire)
- Single-frequency FSK modulation (frequency-shift keying at 433MHz)
- Rolling code ID (each sensor has a unique 8-digit hexadecimal ID)
If your GLS CLASS uses a different protocol (e.g., different OE number), this sensor will not communicate with your receiver. Always cross-reference the OE number on your existing sensor.
Technical Specifications Comparison
| Parameter | BL-ST-037 | Typical Aftermarket Sensor |
|---|---|---|
| Frequency | 433MHz | 315MHz or 433MHz |
| Battery Type | CR2032 (non-replaceable) | CR2032 or CR2450 |
| Battery Life | 5–7 years | 3–5 years (low-cost units) |
| IP Rating | IP67 | IP65–IP67 |
| Pre-Programmed | Yes (for listed OE numbers) | No (requires cloning tool) |
| Torque on Valve | 4–5 Nm (check vehicle manual) | 3–6 Nm |
| Operating Temp | -40°C to +125°C | -20°C to +85°C |
Fitment for GLS CLASS and Compatible Vehicles
The BL-ST-037 is a direct replacement for five specific vehicle applications. Below is the confirmed fitment table:
| Vehicle Model | Year Range | OE Number |
|---|---|---|
| GLS CLASS | 2017–2021 | 4275333W |
| Fukang ES300 | 2019–2022 | 4275333W |
| Honda CR-V (selected trims) | 2018–2020 | ZQ01162780 |
| Honda Accord (selected trims) | 2019–2022 | ZQ01162780 |
| Fukang 5008 | 2020–2022 | ZQ01162780 |
Note: Always remove your existing sensor and check the stamped OE number before ordering. Year ranges can vary by market (US, EU, Asia). For the GLS CLASS, if your sensor shows 4275333W, this is a guaranteed fit.
Recommended Part
For your GLS CLASS or compatible Fukang/Honda model, the BL-ST-037 | BH-Sens 433MHz TPMS Tire Pressure Sensor | Fits Fukang, Honda | OE# 4275333W, ZQ01162780 (SKU: BL-ST-037) is a direct-fit, pre-programmed sensor. No additional TPMS programming tool is needed. If you are replacing all four sensors, order four units and have a tire shop install them with new valve stems and torque to specification.
FAQ
Can I use this sensor on a 2015 GLS CLASS?
No. The BL-ST-037 is pre-programmed for 2017–2021 models. Earlier GLS CLASS vehicles use different OE numbers and may operate on 315MHz. Check your current sensor’s OE number.
Will this sensor work with aftermarket TPMS receivers or monitors?
Only if the aftermarket receiver is designed for 433MHz and supports the communication protocol of OE numbers 4275333W or ZQ01162780. Most universal receivers require a learn procedure — this sensor’s pre-programmed ID may not be recognized by non-OE receivers.
How do I know if my GLS CLASS needs 433MHz or 315MHz sensors?
Look at the label on your current sensor. It will print either “433MHz” or “315MHz”. If you cannot access the sensor, check your vehicle’s service manual or use a TPMS diagnostic tool. Mixing frequencies will cause a permanent warning light.
Can I install these sensors myself without a tire machine?
No. TPMS sensors must be installed from inside the tire using a proper tire changer to avoid damaging the sensor body or valve stem. The BL-ST-037 is a clamp-in type, requiring the tire to be demounted. Have a professional tire shop handle installation and torque the valve nut to 4–5 Nm.