B1 Service Honda When your vehicle needs a type of service, your Honda Maintenance Specialist will tell you what type of service it needs by displaying a series of service codes containing a letter and a number. The "B" in "B1 service Honda" indicates Chicago drivers should go for an oil change and mechanical inspection, while "1" indicates you should have your tires rotated. Mechanical inspection is quite extensive. Let's take a look at what it includes in more detail. We will also cover when to get Honda B1 service. When you have finished reading, be sure to schedule a service appointment if you need Honda B1 service. B1 service code is among the topics that everyone is curious about.