Toyota Repair: Malfunction Light, emission control system, odometer reading

Question
I have a 2003 Corolla CE, 74,000 km, automatic. The malfunction light came on. When it did everything wwas running but it flet like the fule cut out, that is the gas peddle lost pressure. Toyta checked it and recieved the following codes for the ignitor circiut: P1300, P1305, P1310, and P1315. They suggested that this was related to the auto start I had put on. So I take it to have the auto start checked. They disconnected it. I took it back to Toyota and they cleared the codes the originally gave me and another code was there, which he told me was an emissions code and was most likely the emissions valve (?) he told me this was a $65.00 part not covered by waranty. He cleared this code as well. The same day the malfunction light again came on. Took it back to Toyota where the P codes were gone but another code was still present, this time he said it was most likley an oxygen sensor, again not covered by warranty but they would cover 70% of the cost if this is what it was. I have an appointmnet set up. But I guess my question is what were the P codes since no one seems to be able to tell me? And is the oxygen sensor a common problem in a 2003? I know a fair bit about cars, but this is my first Toyota so I am not familiar with the fuel/ignition systems in these. Any help GREATLY appreciated!!
Thanks
Nicole  

Answer
I'm going to look up the codes and get back to you tomorrow, I don't know why they are charging you for anything at all, toyota has an emission control warranty that covers emission control system parts for 3yrs/36,000 miles and 3yrs/50,000 miles for most components, this includes the oxygen sensor, also if you live in the US there is a federal emiision control warranty but since you stated that the odometer reading was in KM I don't think that is the case. I will contact you again tomorrow with the DTC explanation.

The codes refer to igniter malfunctions cylinders 1-4, I don't know what the "auto start" function refers to but it seems they fixed the problem for those codes and they didn't come back.
There is a six page manuscript in the factory manual how to test for these codes and recommendations how to repair this problem, I have no idea what the dealer did to fix it but here are the possible trouble areas:
Ignition system
Open or short in IGF and IGT signal(these are confirmation signals to the ECU that there is an ignition signal and a timing signal to it)
Ignition coil with igniter
ECM(malfunction with the computer)