Kwiksen Oxygen O2 Sensor 234-3113 Upstream Rear/Front For 2002-2003 Nissan Maxima Altima V6 3.5L Upstream Rear/Front Direct Plug-In Replacement Cross Reference Part Number: 234-3113 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.