TPMS — Tire Pressure Monitoring System (4-Sensor)

What to Check When Sourcing

TPMS is a safety-critical product — a failure to alert on a low-pressure tire contributes to blowouts and accidents. Reliability and alert accuracy are the primary sourcing criteria.

Sensor transmission interval and RF reliability. TPMS sensors transmit at intervals (typically every 30–90 seconds when rolling, and immediately on pressure change). Test RF range: the signal must reliably reach the receiver through the vehicle body at up to 30m. Test in a real vehicle, not just on a test bench.

E-Mark for EU OEM-style integration. For TPMS sold as replacement for factory systems on EU-type-approved vehicles, E-Mark R141 is required. For aftermarket accessory use, CE is sufficient. Clarify the intended use case with your buyer before specifying certification.

External vs. internal sensor trade-offs. External cap sensors are easy to install but are exposed to weather and theft. Internal sensors (mounted inside the wheel) are more protected but require tire dismounting to install. For consumer aftermarket, external cap sensors dominate; for fleet use, internal sensors are preferred.

Common Issues

Anti-theft collar. External sensors without anti-theft locking collars are frequently stolen, especially on commercial vehicles. Specify anti-theft aluminum collars as standard kit.

Solar panel energy sufficiency in low-light conditions — Solar-charged receivers often fail to maintain charge in northern European winter conditions (few daylight hours, frequent overcast). Test the display under simulated low-light charging conditions for 48 hours.