Understanding the EZS TPMS Warning Light Behavior
EZS vehicles (including MG, Roewe, and Rising models) use a direct TPMS system where each wheel sensor transmits pressure and temperature data to a receiver module. When the warning light illuminates, it can behave differently depending on the root cause:
- Solid amber light – Low tire pressure or slow leak
- Flashing amber light for 60-90 seconds then stays solid – Sensor fault, dead battery, or signal loss
- Rapid blinking at startup – Receiver module cannot detect any sensors
Four Most Common Causes of TPMS Warning Light on EZS
1. Dead Sensor Battery (Primary Cause)
Each TPMS sensor contains a non-replaceable lithium battery designed for 5-7 years of normal use. When the battery voltage drops below a critical threshold, the sensor stops transmitting.
Symptoms you will notice:
- The warning light flashes for about 1 minute at startup, then stays solid
- One specific tire position consistently shows no pressure reading on the dashboard display
- The light appears more frequently during cold weather (cold temperatures reduce battery output temporarily)
Diagnosis tip: Use a TPMS scan tool (e.g., Autel TS508 or Bartec) to check each sensor’s battery voltage. A reading below 2.3V means the sensor must be replaced. For EZS models, the BL-ST-068 | BH-Sens 433MHz TPMS Tire Pressure Sensor | Fits Im, MG, Rising, Roewe | OE# 10290600, 10625492, 10718213 (BH-Sens BL-ST-068) is a pre-programmed clamp-in sensor that covers most 2018-2023 EZS, MG, and Roewe fitments.
2. Signal Interference from Aftermarket Accessories
EZS vehicles are susceptible to RF signal interference in the 433MHz range. Common culprits include:
- Dashcam power supplies (especially cheap USB chargers)
- LED license plate lights with non-shielded drivers
- Aftermarket parking sensors or radar detectors
- Metalized window tint (ceramic is fine, metallic tints block RF)
Diagnosis method: If the warning light comes on only when specific accessories are powered, test by disconnecting each aftermarket device one at a time. If the light resets after driving 5-10 minutes, you’ve found the interferer.
3. Actual Low Pressure or Slow Leak
Before assuming sensor failure, check all four tires with a manual gauge. The TPMS threshold for EZS is typically 25% below the recommended pressure (usually 32-36 PSI for most models). A nail or valve stem leak can trigger the light even if the sensor is functioning correctly.
4. Receiver Module Fault
Less common but possible: the TPMS receiver module (located near the rear parcel shelf or under the dash on EZS vehicles) can fail due to water damage or voltage spikes. This usually causes all four sensors to show “—” or no data simultaneously.
Diagnostic Table: EZS TPMS Warning Light Patterns
| Warning Light Behavior | Most Likely Cause | Recommended Action |
|---|---|---|
| Flashes 60s at startup, then solid | Dead sensor battery | Replace faulty sensor (use scan tool to identify which wheel) |
| Solid immediately when driving | Low tire pressure | Check and inflate tires; inspect for leaks |
| Rapid blinking, never stops | No sensors detected or receiver fault | Check receiver module connections; verify sensor IDs are programmed to the vehicle |
| Intermittent, only on highways | Signal interference or failing battery | Test with accessories off; check battery voltage on all sensors |
| Light on after tire rotation | Sensors not re-learned to new positions | Perform TPMS re-learn procedure (see owner’s manual) |
How to Identify Which Sensor Is Failing
You don’t need a dealership scan tool. A basic bidirectional TPMS tool (costs $60-150) can:
- Trigger each sensor to transmit its data
- Display the sensor ID, pressure, temperature, and battery voltage
- Show how many times the sensor has transmitted (low count indicates weak battery)
For EZS vehicles, the BL-ST-068 | BH-Sens 433MHz TPMS Tire Pressure Sensor | Fits Im, MG, Rising, Roewe | OE# 10290600, 10625492, 10718213 is pre-programmed and will auto-learn on most 2017+ models, meaning no special programming tool is needed for installation—just mount, install, and drive a few miles.
When to Replace All Four Sensors vs. One
| Situation | Recommendation |
|---|---|
| One sensor dead, others 6+ years old | Replace all four (batteries will fail soon) |
| One sensor dead, others under 4 years old | Replace just the faulty one |
| One sensor damaged by tire repair | Replace just that sensor (check others’ battery voltage) |
| All four show low battery voltage | Replace all four as a set |
Recommended Part for EZS TPMS Replacement
For most EZS models (including MG ZS, Roewe RX5, Rising ER6), the BH-Sens BL-ST-068 is a direct OE replacement. It uses the same Baolong Technology internals as the factory sensor, operates at 433MHz, and matches OE part numbers 10290600 and 10625492. It is a clamp-in design compatible with standard rubber valve stems.
If you are replacing a single sensor, ensure the new sensor’s ID matches the frequency and protocol of your existing sensors. The BL-ST-068 is pre-programmed to work with the EZS TPMS system without additional configuration.
FAQ
How do I reset the TPMS light on my EZS after replacing a sensor?
Most EZS models reset automatically after driving above 25 mph for 10-15 minutes. If the light stays on, perform a re-learn procedure: turn the ignition on, press the TPMS reset button (usually under the steering column or in the glovebox) until the light blinks twice, then drive for another 10 minutes.
Can a TPMS sensor battery be replaced, or do I need a whole new sensor?
The battery is sealed inside the sensor’s epoxy housing. Attempting to replace it often damages the circuit board and breaks the seal, leading to moisture ingress. You must replace the entire sensor unit.
Will a dead TPMS sensor affect my EZS’s engine performance or safety systems?
No. The TPMS warning light only indicates tire pressure status. A dead sensor does not affect engine performance, braking, or stability control—but you lose the ability to monitor your tire pressure, which can lead to unsafe driving conditions if a tire gradually deflates.
How do I know if the problem is a dead sensor vs. signal interference?
If the warning light appears only when you use a specific accessory (e.g., phone charger, dashcam), it is likely interference. If the light appears randomly and a scan tool shows one sensor with low battery voltage (under 2.3V), the sensor battery is dead. Also, dead sensors typically cause the light to flash at startup; interference usually causes the light to come on solid after driving.