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What is Direct TPMS? Each wheel of the vehicle has a sensor fixed to monitor the changes in pressure from the tyre. Tyre pressure sensors also measure temperature. Each sensor sends its signal to the receiver inside the vehicle using a wireless connection. In Europe the transmission frequency is 433Mhz. If low pressure or a leak is detected (generally 25% less than normal operating pressure), the driver is alerted by the in-car system and generally the deflated tyre is identified. Direct TPMS is very accurate measuring to 1 or 2 psi. A puncture after parking is immediately identified. Sensors send...

Direct TPMS market leader Schrader International, has warned of the presence of unauthorised and even counterfeit sensors in the European market. Problems include non-standard packaging, non-standard screws, non-standard valves and re-marked and re-branded items. Writing in an open letter on the subject, Schrader International, Alfonso Di Pasquale explained: “It has come to our attention that there are certain non-authentic Schrader branded TPMS Sensor products which are being made available in the aftermarket and which we are concerned may be defective and/or cause a risk to consumers or users. The letter continued: “While these parts may appear from first look to...