Tyre pressure sensor (754)
 
  
 
 
  
   
    
     |  | Tyre pressure sensor (754) | 
   
  
  
   
   
    
    
    
    
    
   
   
    
   
   
    The pressure sensor is located in the tyre valve.
    
    
    
      
    
    
   
   
  
  
  
  
  
  
   
   
     
   
   
  
  
   The sensor transmits tyre pressure information to the control module which in turn informs the driver if the air pressure in a tyre is too low.
   
   
   
   
   
   
   
  
  
   
  
  
   The tyre pressure sensor is an integrated sensor, transmitter, battery and valve. It comprises a plastic housing, with an electronic unit, which is joined to an aluminium housing with a valve. On the valve are a tapered seal and a crown nut, which is used to fit the valve into the corner of the wheel. The sensor weighs approximately 38 g.
   
   
   
   
   
   
   
  
  
   
  
  
   There is a 3V (500 mAh) lithium battery in the sensor which is activated by a ball switch in the electronic unit. The battery is not replaceable.