We have 2 Gen 1 Tucsons, one CVVT and one CRDi. The CRDi has been emitting a harsh squeaking sound whenever going through bumps when fully steered, in both directions. We have brought it to 2 Hyundai dealership and both have not solved the problem. The CVVT version has been worry free except for the occassional keyless entry malfunction and relatively high fuel consumption.