It is not an error code, it is a diagnostic code. This is part of the Diagnostic Test Mode for the System Sensor Signal Test TPS OK in idle position (when throttle is moved) 3-3-2 Itm #3 in the following link http://www.swedishbricks.net/700900FAQ/Engine-Codes1.html
You can locate the radio code, for your 1991 Volvo, by consulting your owners manual. The owners manual should have all of the vehicle codes.
turbo overboost
VOLVO 220f I ECU błąd sieci
You have to take it to a Volvo dealer. They can look up the code in their database. Each radio has a unique code based on the serial number of the radio.
go to www.the12volt.com
Trouble code P0352 means: Ignition Coil B Primary/Secondary Circuit
The OBDII error code of P0299 is a generic for a low boost condition. This could mean a turbo charger and or air induction system problems.
Turbo/Super Charger boost control solenio circuit A open
diconnect the battery then connect it
P0058 HO2S Heater Control Circuit High (Bank 2 Sensor 2)
It is an error code that says the variable valve timing is out of limits, may need a timing adjustment or a new vvt solenoid
EGR valve I believe