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Hello,

Ever since I bought my 2006 300C (used), I have been getting a system warning about TPM for my left rear side tire. Now, I changed tire positions but still getting that warning from the same location so it can't be a tire issue..Any ideas? Ah..forgot to say that I even get these warnings when I am parked.
 

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Welcome to Allpar. It may be the TPM receiver in that corner of the car has an issue, not the tire valve stem transmitter if you've swapped wheels around.
There are 3 dedicated TPM receivers near 3 of the wheels, the WCM (wireless control module) knows that the 4th TPM signal it hears is at the corner without a dedicated receiver so all 4 tires are monitored and their positions known.
It takes a few minutes of driving above 15 mph to learn the new tire positions and pressures. Each TPM transmitter has its own unique ID serial code.
A WCM/TIPM/CCN fault code may be present regarding the TPM receivers, but the dealer scan tool is probably the only one that can read it.
 
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