How to use the CN900 Key programmer software III

Attention: TPX4 is used for collecting data. Now you have used this TPX4 collect the data for original key and copy another key succssfully. For next time, if you want to use TPX4 to collect data, you must clear the data first. How to clear the data for this TPX4, here is the detailed steps:

1)  Put TPX4 on CN900 key programmer just like this photo:

2) Click “SPECIAL” button.

3) Click “GENERATE CODE” button.

4) choose “Blank 7936”

5) click “GENERATE” button

6) click button “GEN”

7) Several seconds later, you will see “Success” on the screen. It means that data has been erased. And you can use this car key programmer TPX4 to collect the data for next time.

Now instruction is over, if you still have problem, please send email to


About eobd21

I am a car lover and like to repair car by myself, and know more info about car diagnostic tool and other obd2 tools, share these info with everyone.
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