Quote:
Originally Posted by the_snuggler
I don't know anything about cars
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This is the killer.... I'm no longer giving long distance courses on auto mechanics; It's a thankless position and seldom goes well.
There is the possibility of a blown head gasket causing those low compression readings you would need to do a dry compression test and a wet test back to back to see if the compression changes at all.
The turbo error code may be a bad airflow meter or an opening or tear in the intake piping.
Codes 24 and 31 will happen if you unplug the airflow meter while the ignition is on, I would disregard that unless it is recurring.
The oxygen sensor is only a trim sensor, for not just check the wiring for shorts and leave it alone.
You can get the turbo rebuilt (if it's a good core) for $600, no need to spend $6,000 on a new one.
A *full* rebuild will usually cost you under $4,000; It depends on the market in your area and the availability of used parts if needed.
I hate to be the kind of person who just says read the f'in manual... but, RTFM:
http://www.cygnusx1.net/Supra/TechTi...ror_codes.aspx
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/
Take it step by step... start with dry and wet compression tests.