GMPartsGiant.com offers the wholesale prices for genuine 2018 Chevrolet Sonic Sedan parts. Parts like Wiring Harness/Instrument Panel are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 1.4L, 4 Cyl 1.8L. Model Code: LS 4 DOOR NOTCHBACK/SEDAN, LT 4 DOOR NOTCHBACK/SEDAN, LTZ 4 DOOR NOTCHBACK/SEDAN.