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New user, looking for 2002 seville data

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Hi all, I am new. Looking for some of your vast experiences with the sweet cadillac mobiles. As the topic title displays, my 2002 seville sts, is throwing a check tranny fault. Transmission was recently rebuilt and is still on warranty. Using a low end obd-II reader i am told it is a PO410$10 (Secondary Air Injection System). Whats that, and how do I economically rectify it? Thanks in advance for any, and all responses.

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A secondary air injection system fault is not a transmission code.

With the ignition in the run position, simultaneously press and hold the ON/OFF and INFO UP buttons on the dash. The system will enter diagnostics mode by testing the display segments and then ALL? will be displayed. Press the ON/OFF to display the trouble codes and post them back here. In the diagnostics mode, the info up/dn is used to scroll through the parameters, INFO RESET is used to say "no" and ON/OFF is used to say "yes" to the system. Repeatedly press the INFO RESET to exit diagnostics or turn the ignition off.

'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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