I bought my daughter a 99 Honda Accord. It's a real clean car with 86K
miles.

I recently put $1300+ dollars into it for the Timing belt/Water pump and
all belts replaced as well as completely new front brakes and rotors.

No sooner does she start using it again then the check engine light
comes on. The garage we take it to says they need another $1000 to
replace the Catalytic Converter. They told me the codes read that the o2
sesor was bad and the Cat was bad.

This smelled a little to me, like one of those "oh, it might be the 02
sensor, or the cat, but we just rerplace everthing and make more money
that way" kind of answer.

Do Accord cats really fail at 90K miles?