Car engine diagnosis device

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Dear Experts,



I'm totally new on engine diagnosis devices & how to do the task. I have 3 cars of Toyota, Honda and Nissan brand and running a car renting business in a small scale. Now a days I'm regularly facing different types of related with engine & mechanical faults(not related to engine) Everytime the repairing shop charges a good amount for scanning purpose. The mechanic says its an expensive process to do the scan. After searching on net i come to know the reality.



Please help me by giving a link to buy a suitable device for scanning to locate the problems.

I think its an OBDII adapter, its one end will be connected to the car's obd port and another end with the laptop to do the scan.



I dont know whether the software will come with the port or not ? If i need to buy the software seperately, please suggest me the links of some good software.



There might be some good quality scanning software free on net, please give me the link to download.


Please help....


I didn't find the right solution from the Internet.

References
www.cnet.com/forums/discussions/car-engine-diagnosis-device/
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