Here's one I've never seen before: 2011 S Xterra Last week new tires also left rear TPMS replaced as it was defective. Two days later left rear is losing pressure, has a screw in it, tire repaired. Today TPMS "tire" indicator starts flashing, then goes solid. No "Check Tire Pressure" message is displayed in the dash display. Checked tire pressure and adjusted them all to 40 and then took a spin around the block. Tire symbol still flashes and then goes solid. Scanned for codes... there are none. Has anyone had something like this? is there a way to detect a defective TPMS sensor?