Hi guys,
I just picked up a 97 Honda Civic with 297,000 miles on it.
it has a check engine light on; I tested it with an OBD2 and pulled a P0141 code.
it has an aftermarket full exhaust on it with only the front 02 sensor plugged in.
I was able to finally get under the car to look and see if the secondary 02 sensor plug was there and only found one single blue wire hanging down.

Currently in the process of doing a valve adj; with new gasket, oil and filter change.
was thinking of going back to OEM exhaust.

thoughts? Any and all help appreciated.