How do I reset the "service" light on 98' Infiniti QX4?

Answer 1

Hook a generic scan tool to the white plug under the dash and record on paper the code you also looked and wrote down the freeze frame data then clear the code. P0420 codes for the cat converters are common to that year. Other notable codes P0455 gross evap leak, caused by loose gas cap. Once the code is cleared the car needs to be driven from cold motor for about 20 minutes to do all the diagnostic things to pass emission tests. The engine light won't return until the computer sees the same failure two times. Gray plug at the fuse box is for Nissan techs like me to use.