It appears that there are 2 codes;17 (O2 sensor is shorted to pos. or gnd) and 29 (CFI and Ign. Control module reading different engine coolant temps). The O2 sensor I can replace with a good used one I have, but I'm not sure what to do about the other code. Any ideas? Are there different temp sensors associated with different electronic modules? Is there a way to test them?