Toyota Repair Problems? Ask a Mechanic for Answers ASAP
If the cars has a high oil consumption and struggles to pass an emissions test its likely to be burning the oil and not leaking it out.
The first thing I'd check is the crankcase pressure relief valve (PCV) these are sprung loaded and are only meant to 'burp' excess pressure every now and then. The exiting gas is piped back to the inlet , however should the valve stick open then the engine tends to suck the air out of the crankcase all the time and this carrys oil over with it.
If you remove the air intake pipe and look inside where the crankcase breather is plumbed in you may find evidence of oil.