20 Most Recent 1999 Volvo S80 - Page 6 Questions & Answers

most likely your brake light. Also if no brake lights are out, volvo is notorious for putting the wrong bulbs in from the factory. If they work take them out, if they have an orange bottom inside the buld replace the bulbs. I used to be a volvo tech. I would replace both so you dont run into this problem again

either a coil pack or one of the O2 sensors playing up check the sensors with diagnostic tool ,use the pid and with engine running and someone else driving you check the readings for everything especially the O2 sensors

Get some wd-40 and try to get the hinges and latch of the fuel door.

thry an oil stabeliser like lucas or stp with and oil change and filter

If you do run your car out of gas alot it will burn up the fuel pump.

open your trunk, between the rear speakers.

This is TPS sensor or IAC sensor.

This type of problem is very difficult to give advise online without actually checking the car out? The problem you are describing sounds like you are having an issue with the electronic throttle module. For the throttle to work properly you need good battery voltage going to the throttle. One thing you should really check when this happens is the charging system. There was some issues with the voltage regulator when it would get hot while driving for a while, the voltage regulator would just start to quit. If Voltage to the throttle goes low enough then the throttle stops responding. Most of the time there will be no messages on the cluster or warning lights but I would highly recommend you go to a shop that can actually scan all the control modules especially the central electronic module and the electronic throttle module for codes related to low battery voltage. If there is voltage codes then most likely the voltage regulator is failling. If you order one from Volvo, they stock an upgraded version of the regulator. Compare prices for the regulator vs. a complete alternator. If you are not saving much money, with the mileage on the car I would just replace the whole alternator. If there are different codes then further diagnosis would need to be done to see if it is a bad throttle, bad accelerator pedal, or an issue with the wiring? I hope this helps you with starting with some basic steps and please keep me posted.

Either replace the cam position sensor or adjust cam position if incorrect.

Could be a bad multifunction switch or even the flasher relay

anti theft lock in the steering column or its not registering the brake pedal being depressed.