Coverage definition by Schrader EZ-sensor® 2.0 (true) coverage


Coverage is used in the TPMS aftermarket as one of the most important benchmarks for comparing products from different suppliers, however there is a lot of misconception, and misleading communication, of what exactly coverage means and how it is measured.

Schrader believes that the most important baseline for coverage is the current vehicle car park equipped with direct TPMS in Europe i.e. the number of vehicles on the road with TPMS which could be serviced with a programmable sensor instead of the OE sensor.

This means, that if a programmable sensor has "70% coverage", it can be used (with full electronic & mechanical compatibility) on 7 out of 10 cars in Europe for either replacement or winter wheels.

In the absence of a standarised method to calculate coverage, it is easy for customers to be misled and make incorrect choices. Here are the reasons:

  • Deceptive definition of coverage: Percentage of number of models covered is meaningless in relation to the percentage of vehicles in the car park which you can service. If a programmable sensor covers three different Ferrari models, but not the Mercedes A, C and E-Class and it is not taking into account the number of cars of this model actually running in the European car park. This would result in a high percentage of vehicle model coverage, but a low percentage of vehicles on the road. To take this one step further, some suppliers include US vehicle models that are barely even sold in Europe.
  • Limited OE functionalities supported: In the past, TPMS sensors provided pressure information only, nowadays TPMS systems can autolocate the sensors on your vehicle, providing real time positional updates on the in-car display. Schrader believe, that in order to "cover" a vehicle, the programmable sensor should fulfill all of these OE functions. Many suppliers only provide the basic pressure information, therby limiting the system features, and still claim "full coverage". Such a sensor should not be described as covering this particular vehicle.
  • Bypassing OE autolocalisation function: by programming the tyre position: Some Non OE competitors can only bypass complex OE autolocation systems by hard wiring the tyre position into the sensor with a tool. Even though this might work at first sight, Schrader tests have proven that some sensors fail shortly after running in the field, and can deliver false positional information. Such a sensor should again not be described as covering this particular vehicle.


The Schrader EZ-sensor® has leading coverage and OE performance in the market today, with the EZ-sensor® 2.0 covering more than 97% of the total vehicle car park by December 2015. We do this with one sensor chipset only, not with several different ones. One sensor and the customer’s choice of rubber (10 degrees) or alluminium valve (10 or 0-40 degrees angle).
The strategy from Schrader is clear. We have developed electronics hardware that is capable of matching all OE functionality, and with the release of each new software update (application code), our coverage increases incrementally. This allows us to cover 100% of the vehicles on the road, and to be ready for new vehicles entering the market.
Once our customers have the new EZ sensor® 2.0 on stock, those existing parts can easily be programmed with the new application codes delivered by Schrader, without running the risk of having obsolete products on their shelves.

Our target is to maintain this 100% coverage in the long term and ensure our customers that Schrader EZ-sensor® 2.0 is the best choice in TPMS replacement products.
1. We ensure all OE Schrader parts are covered before they are launched in the market (OE sensor code is converted to EZ-sensor format during development)
2. We ensure all NON-Schrader (OE competitors) parts are covered by EZ-sensor® 2.0 within three months after launch.

Roadmap 2015 on EZ-sensor® 2.0 Coverage (based on 2015 car park)

June 2015

September 2015

December 2015





   *Volume of vehicles on the road with direct TPMS