Maintenance minder service codes these codes indicate what services are due on your vehicle. The code “a1,” for instance, means you need to replace your vehicle’s oil and to rotate your tires, ensure appropriate tire pressure, or have your tires replaced. 2017 Newest Xtool Ps701 Jp Diagnostic Tool Ps 701 Japanese Car Diagnostic-tool For Japan Cars Obd2 Scanner Free S Car Diagnostic Tool Japanese Cars Car Scanner I usually change my oil at 15%. Honda service codes a1 . For information on maintenance codes, see page , or refer to the civic sedan owner’s manual. I checked what a1 means (because it would be too easy if honda just put the actual message on the lcd screen.) and it looks like my car is asking for an oil change/ tire rotation. Your authorized honda dealer knows your vehicle best and can provide competent, efficient service. 9 is also for canadian models and is telling you to service the front and rear brakes. A1 service appointments seven days a week 7 is only app...