enGage

Last spring I had a new set of tires installed. I replaced the TPMS sensors at the same time with a set from OEWheelsllc. The car recognized the sensors and all was good. Recently when I display the tire pressures all I see is blank lines- for all five tires. The system is not throwing a fault and once I got the readings back by doing a reset(change tires option), but yesterday that did not work. Any ideas what the issue might be?

ltooz_a6_a8_q7

it will take a while for the readings to come back... At least 25 miles of driving.

mishar

That happened to me once (for now) with same sensors. Could be that difference between OEM and this price.

enGage

OK, but why no fault detected? The ECU should throw a code if it can't read the sensors.

Brozee

It's not that it isn't reading it; it is getting new values. As mishar said it takes a while of driving. Just ignore it for now and check it in a few days. The car throws a fault when it sees that one is dead or has low air pressure. It is still initializing, give them time.

enGage

OK, I stopped to fuel up today and decided to hit the TPMS reset (change tires) and take a long drive. Sure enough at around 15 miles into the drive the tire pressures show up. Most of our trip are short so I'm thinking one of us must have hit the tire change and never given the car enough time to recognize the monitors. I'm happy and close the MMI. just before I got home - about 8 miles later, I open the MMI and display the tire pressures - all dashes again.

I've don't know much about TPMS systems, but I image that each sensor has a unique ID and when tires are changed it takes awhile for the car to figure out which sensor belongs to which wheel. But, what would cause the car to loose that information without throwing a fault?

mishar

There are 4(5) sensors with their own batteries, 4 antennas, wiring and TPMS Module. Most likely it is one of sensors but only VCDS or VAS can tell.

By the way, no need for Change Tires function when one change tires. System will just pick up new signals and go on.

jakematic

Agreed.

Double check the frequencies are all correct and take a look at the TPMS battery life measuring block as well.

enGage

No need to check the frequencies, the 5 new sensors worked fine for the first 6 months and work intermittently now. If one or more had a falling battery the others would still read and the ecu would throw a code. This is what happened with the oem sensors and why I replaced them. I'll give it more time and then decide if I bring it to the dealer or love with it.

mishar

That will cost you at least $2000. They will replace all 5 sensors with OEM's, $150 each, plus few other components until they find what's wrong. It is cheaper to find what's wrong yourself. It's more fun too.