Auto Safety Center 444 North Main Street West Bend WI 53090 (262) 334-7241 http://autosafetycenterwb.com Honda Civic NGV (Natural Gas Vehicle) in the shop for a Check engine light P0420. This vehicle was in the shop several weeks prior for a misfire which was repaired unfortunately misfires that cause the Check engine light to blink can cause catalyst damage and that is exactly what happended here.