Kwiksen Oxygen O2 Sensor 234-4089 Downstream For Chevrolet Cavalier Pontiac Sunfire Direct Plug-In Replacement Cross Reference Part Number: 234-4089, 2344089, SG472 Position: Please check compatibility in Description Warranty: One Year Unlimited Miles This is Brand New High Quality Aftermarket Product. Meet the professional specification as OEM parts, for stable performance durable service.