Most Audis have indirect systems, but they have direct TPMS as an optional extra. At least that's the case on the European market, unsure about the US market. S

Most Audis have indirect systems, but they have direct TPMS as an optional extra. At least that's the case on the European market, unsure about the US market. Some premium Audis also have loose wheel detection, which is based on a similar technology as the indirect TPMS.