A flashing upshift light on a 1999 Volvo S70 typically indicates an issue with the transmission or the engine management system. Common causes include low Transmission Fluid levels, a malfunctioning transmission control module, or a failing sensor. It's advisable to check the transmission fluid, as well as to read any diagnostic trouble codes (DTCs) using an OBD-II scanner. If the issue persists, consulting a professional mechanic for a thorough diagnosis is recommended.
If its an automatic then your either in winter or a low gear(not flashing) or transmission fault(flashing arrow) But if its manual the non flashing arrow is the recommended time to up shift.
diing
A mechanic advised me that it meant the speed sensor needed replacement, not verified.
by looking at georga
This sounds like what happens when your timing belt breaks.
change the relay. it works. cost was $80. part+service
Thermostat and thermostat sensor (ect) bad
More than likely this is caused by the relays. They are both the same relays and anywhere carries them.
No problem, best car model in the world.
"Some Volvo S60's do tend to have problems. Consumers have reported stalling, coolant leak, gas pump failure etc. on their vehicle. It is recommended to purchase extended warranty on these vehicles."
MID 128 PID 111 has to do with the engine coolant level in the Volvo. It is a code that can be gotten when the check engine light is flashing.
the relay needs to be replaced. you will find it behind the hazard switch (attached to the switch - a long skinny thing) I looked forever till someone told me where it was. Even the Volvo parts guy didn't know and Lawrence Volvo of Walnut Creek, CA would not tell me...