Toyota Repair: Toyota Corolla 2001 P Code, toyota corolla 2001, mass air flow sensor

Question
I have a 2001 Corolla with about 164,000 miles on it. I've had my check engine light on for a while, finally took it in because I was having trouble with the car turning over it would take 3-5 times sometimes. My mechanic got 3 codes when he ran it 300, 302 and 171. He changed the spark plugs and the Mass Air flow sensor and cleared the codes this was yesterday. I'm on my way to work this morning and the check engine light came on again. Car seems to be driving just fine now that he changed those 2 things, is there something else we should be looking for?

Answer
In order for me to help I would have to ask you to have the computer scanned again because the codes may be different now, you don't necessarily have to go back to the mechanic, you can have an Autozone or similar parts store scan the computer for you, they do this at no charge, then let me know what they are.