OBD-1. 1995 was a changeover year. All 1995 cars/trucks (GM to my knowledge, I don't know about the other brands) were OBD-1 and some have an OBD-2 connector, but still are OBD-1.
No
You must have an engine scanner to do that.
Trouble code P0128 means: ECT Sensor Below Thermostat Regulating Temperature
By code scanner, I assume you mean an OBDII scanner to scan the dignostic codes from your vehicle's computer. OBDII scanners are available at most auto parts stores. I bought one at Walmart for about $60. You don't mention what year model your vehicle is, but if it 1995 or later, an OBDII scanner is necessary, If it is pre-1995, you may be able to retrieve the codes manually. . . . check your public library to see if there is a repair manual (Haynes or Chilton) for your vehicle available for checkout. The manual will have instructions on how to obtain the codes and what each code means.
After reading the codes with a scanner, and repairing the cause, you clear the code with a scanner
First you have to know carbureted of EFI and what year? go to web site for more information. http://www.troublecodes.net/mazda/ These are for OBDI codes. If you need OBDII codes they are different. Hope this helps.
You need to use an OBDII scanner (available at your local auto parts store) to see what the diagnostic code is. Depending on what what fault code is, you either have to fix something or you can clear it and see if the code returns. You can clear the code (turn out the light) with the OBDII Scanner. Personally i bought a ScanGaugeII for this and it's AWESOME! the Haynes and Chilton repair manuals will help you figure out what the code means.
Sorry, only a scanner can retrieve trouble codes on OBDII vehicles.....
Depending on the year, use either an OBD1 or OBD2 code scanner. You can borrow, rent or buy a code scanner from most auto parts retailers.
I assume you mean radio scanner frequencies? If so, RadioReference is an excellent resource: http://www.radioreference.com/ If you are talking about error codes from your car, you might have to Google those. I'm not sure if OBDII codes are universal (they very well may be). You could do a search on OBDII codes to see what a specific code you are getting means.
Plug in a code scanner. Usually you should be able to figure out what's going on if you use an OBDII scanner for vehicles in that range.
You'll need to find out why it's on, use a code scanner for that. The OBDII code scanners generally allow you to clear the code after you've replaced the faulty part(s).