asn

I am looking at buying a used 2006 A4 cab with 90,000 miles on it. The timing belt was replaced at 75,000 miles as a CPO, but the owner didn't replace anything else. Do these need to be replaced ASAP? If not, when should they be replaced?

It is a 3.0 V6 if that matters.

Other then that, the 5, 15, 25....75k services have been performed.

Audi for life 1987

Thats up to you but its cheap insurance. One of those fail and the motor is toast!

MikekiM@PureMS

Absolutely.. All the timing components should be changed together.
Tensioner, relay rollers, belt, waterpump.

asn

So, the timing belt was changed at 75k, and the car now has close to 90k. Do we bit the bullet and do the rest now, or wait a while?

It is my understanding that you do the other things along with the timing belt, to save on labor in case any of those fail, but the timing belt is the most important thing to get swapped out.

Spinnetti

Tough call. If you are going to pay somebody to do it, i'd wait and risk it.

turbo510

A "timing belt failure" is often the result of something else failing first. A tensioner looses tension, or a idler pully, water pump, or even a camshaft seizes. So just changing the belt may not improve the risk of breakage.

initialA4

if you are doing the timing belt, might as well do it all since its all in the same area!