What is a b13 code? - 2010 Honda Civic

B - Replace engine oil and oil filter.
1 - Rotate tires, and check tire pressure and condition
3 - Replace transmission fluid and transfer fluid (if equipped).

Here is a description of what each individual Maintenance code means for your vehicle. (Please remember that more than one code may be displayed at a time)
A - Replace just engine oil and Filter
B - Replace engine oil and oil filter. Also inspect Brake system and components and perform a tire rotation.
1 - Rotate tires, and check tire pressure and condition
2 - Replace air cleaner element, check drive belt, and replace dust and pollen filter.
3 - Replace transmission fluid and transfer fluid (if equipped).
4 - Replace spark plugs, replace timing belt (if equipped), inspect water pump, and inspect/ adjust valve clearance.
5 - Replace engine coolant
6 - Replace rear differential fluid (if equipped).