jw1977

When you get aftermarket tpms sensors installed, is it the installer that programs at what psi the alarm goes off or is it still the factory settings of 33/39?

jhbrennan

Sensors don't get programmed - they just transmit. Reading parameters are set by factory with some input by user (summer/winter, full load/partial load, etc.) via the OBC.

jw1977

Okay, thanks. My tire guys charged me to "program" them. I figured it was bull but wanted to make sure.

A4EP

It depends on what sensor they installed. Now-a-days both Continental/VDO and Sharader sensors come as a "one sensor fits all". So the tire shops dont need to carry 50 different sensor types for each vehicle they just carry 2-5 and for a lack of better terms "program" or activate them to your car make and model so it transmits correctly. This is done with a handheld tool.

jw1977

So if the sensors all read 5 pounds high, is that a problem with the sensor or what's being read by the obi?