This '02 Hyundai sonata 2.7 L, is displaying S. T. trim at -31, inj. ms around 2.7 on both banks, AF sensors are both active up and down, in closed loop, DTC - P0420. Disconnecting any inj. on bank #1, ST trim goes to around -2, none of the inj. are leaking, ?... Login to read more.