ok guys I need some help
 

the car I was going to do a timing belt replacement on has other problems
too... apprently my friend thought the MIL was not a problem and she was
driving with an engine check light for a while

I checked the code - code 65
Secondary HO2S Heater Circuit Fault (Sensor 2)

The engine runs smooth, but sometimes during startup, one can notice a
slight scraping sounds (very slight).

I dont know what the seconday Heated O2 sensor circuit does, reading up on
it right now. In the meanwhile... are there any suggestions? advice?
I promised to do this today, but it's taking up way too much time and I'm
already missing a shitload of labs at Concordia. I would like to be done
with it asap.

Any help on this is appreciated, waiting for responses.

Thx

Yuri