Left low beam malfunction TPM Malfunction Diagnosis: Drivers side Xenon light failure, causing low beam malfunction warning. Bulb burnt. TPM malfunction caused by missing TPMS in winter tire setup (17" style 138's, stock ride on 19" 172's) Resolution: Dealer quoted $290 for replacement Xenon light, purchased 2x D1S 35W 4600k at car quest for about a third of the price. Two torx screws hold in lamp assembly, undo and pull slightly forward, small access to back of low beam, remove old, put clip on new. TPM malfunction, I'm ignoring. Check TP periodically