A transponder key chip produce unique radio frequency code signal which sent to ECU to match with the code stored in the ECU memory already.If the signal is recognized as a signal that stored in the ECU memory(get authorization),then the key can perform locking,unlock,starting engine and other function.More often than not, this makes them expensive to replace. If you would like to bypass your transponder key every time you start your vehicle or are installing a remote starter, consider bypassing the ignition security.
More knowledge about transponder key chip read below article:
How To Choice Transponder Key Chip Type:Chips Classification
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