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The cars are now 6 to 8 years old. Past due time for the batteries in the sensors to start failing, across the entire fleet. I just all four of mine replaced.
I would agree at 8 years. Maybe one tire sensor has failed... the 2.x system will just give you a fault of everything and not any details. but if one has died, then replace all 4. 8 years on battery powered sensors is pretty good.
While a similar issue I am not sure it is a cover up. It seems that TPMS have little batteries in the sending units. So every 5-8 years they will need replaced. Annoying but not unexpected. But I am willing to bet any tire store can replace the Volt where Tesla has not made this an option for us.
Here is a very amusing fix from the Lotus board: "Here's my TPMS fix. I decided not to epoxy the sensors in the wheels as suggested. I took a piece of 3" PVC pipe and drilled a hole for one of the sensors at the half way point of the tube. I then mounted that sensor in the tube with the stem sticking out and bolted the sleeve down tight (use a little silicone to ensure seal). I then used PVC glue and put end cap on one end of the tube. Then placed the other 3 sensors in the tube with a little bubble wrap (after all I'm not making a rattle). Then I removed the needle from the valve sticking out and glued on the other end cap on. When everything was dry (wait 24 hrs - don't get impatient), I replaced the needle in the valve, filled the tube to 40 psi, placed it in the trunk with velcro and sha-bang, the TPMS light when out."
I am not sure if the sensor is the same as the Elisse / Exige - Lotus Saab TPMS 13227143
Now I'm getting the TPMS error, too. So I guess it would have been wise to request sensor replacement when I had all four tires done not too long ago. It will be a while until I replace tires again.