went out today and took my moms car and i noticed a cel . went to check it and it came up with a code 65 . found out it was an rear o2 sensor and it stated that it is a "circuit malfunction detected [obd 2]" . is there any way of going about fixing this or does this mean i just have a bad o2 sensor and i have to replace it with a new one ?! mom said she been driving around with the cel for about a month now with no problems . so should she be worrying about it or not ?! o its a 96 accord lx .

 

if it has less than 150,000 miles on it ,take it to the dealer,it is free. 15yr,150.000 warranty ext.