I don't doubt you either . . . My 2009 TT engine production date is 08.08.30 and is the BPY variant. You are correct in that that it only tells me there is a inflation problem, not what the psi is for each tire.The only TT (Mk 1, 2 or 3) sold in the US with factory-installed direct measurement TPMS is the Mk 3 TTRS. All others came with indirect rotation measurement. (This includes my 2 Mk 1's, my 2011 Mk 2, and my 2017 Mk 3) Direct TPMS was never even offered as an option. If what you say is true then you own a unicorn, because after an extensive internet search I found a Euro reference to direct TPMS on a few early production 2009 TTs that was then switched during 2009 production back to indirect to comply with Euro regulations. You own a unique TT. I assume yours only gives you an alert and not tire pressure readings?
My Wife's 2010 Prestige Quattro 2.0 Base also has them because I replaced them all when I did tires not that long ago. Same as our 2009 CC with the CCTA engine.I am sure, it has Audi TPMS sensors with metal.stems on each wheel (part # 1K0907253D) and the TPMS control (315MHz) module (part # 8J0907273A) is located behind the instrument cluster (speedometer). I bought my 2009 TT new from an Audi dealer. Check out the part #s. I think they moved to indirect from 2013 or 2014 on.
Not sure about the model years w/o doing research. No false alerts with over inflation, however, you can set parms via VCDS (from what I recall).Well you learn something new every day. I've been following several TT discussion forums for 20 years and this thread is the first that indicated that any TT had direct TPMS except the mK 3 TTRS. As I mentioned previously, my 2001, 2004, 2011, and 2017 TT did not have direct TPMS. They were all base TT roadsters. It would be interesting to find out which Mk 2s had it and what years. My guess for the base TT would be 2008-02010my and they eliminated it with the Mk 2 refresh for 2011my. My main gripe about the indirect wheel rotation-based alert is you get an alert when the tire is underinflated which is what you want, and when the tire is over-inflated which is a nuisance. In the desert SW I get an over-inflation based alert about once a year on long distance freeway driving through the summer desert. I then have to stop the car and check tire pressure with a gauge to confirm it is a false alarm. Do you get false alerts for over-inflation with your direct TPMS?