I am interested in a 2001 volvo s80 with a service engine light and brake and abs lights. what might the problems be

bad ABS module

transmisson replacement is necessary.
thanks.

There are many codes that could trigger the Service Engine light. Have Autozone, etc. pull the code. Without it you won't find out much without manual diagnosis.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

Got same error. Did you solve yours? If not, I'll share solution if I find one.

Check the two (2) 30 amp fuses for the ABS system that are located in the fuse box, under the hood by the Air Filter.

having the same problem with my 1999 s80 2.9 . replaced the abs module twice and still get the brake failure warning. when the ignition key is turned there is a clicking sound from the center console beneath the shifter, then the brake failure warning, and the car will not start. (also after the last abs module replacement the car sometimes gets stuck in park).

the check engine light is probably related to the abs light. have the car scanned to find out wich sensor is bad. it's probably one of the front wheel speed sensors going bad or the abs module is going bad

I have a similar problem, I am going to assume that most of the lights have gone out and you are left with the check engine and a transmission service message. Check the OBD for the error codes and see what they say. If they are P0722, P1618, P1633 it is likely your ABS module. This module appears to have a life span of 5 years to 80,000 miles average before it needs to be replaced. Other symptoms of a bad module would be that the ABS light comes on while driving down the road. Than goes out on the next engine restart or two. Victor Rocha is reconditioning ABS modules for $125.00 and upgrading them to better than factory. There are instructions on the web of where and how to remove the ABS module. This is better than the dealer's new module for $995.00 plus installation.

i had a problem in my S80 .Abs ,STC Brake failure,check Engine and speedometer all of tese didn't work , i just changed the ABS module...it's done now :) just perfect

did u change both bulbs anyway