My aircond is now smelling real bad when I start it off, the smell lasts like 5 minutes..

I thought Honda suppose to change the air and pollen filter during 20k but they didn't, my next service is next month.

Can I just get it change outside? The price is only like RM25 for the filter but Honda is charging 162.37 as refer to the service table on the website.

Will this void warranty and reduce the labour cost of 133.56?