Check engine light p0171 code

[2004sahara]

This morning I had a slightly rough/lower idle .. Then the dumb dumb light came on. I did the key on-key off thing and found code P0171. On line searches indicate multiple things like lean or rich bank 1 o2 etc etc...... I dumped in a bunch of cleaners in the gas , checked the vac lines under the hood and in rear wheel well...... Now the funny part, yesterday I had it under coated with krown and I had the rear wheel well liners removed.... I am not sure if this is coincidental or not. I removed the battery cable to shut off the light, smo it's off now and it seems to idle and drive good again.

Have you ever had the P0171 code?
What did you do to repair it?

Thanks for any and all help.
Kevin

[Enos]

Check the connections on the downstream O2 sensor(s).

[2004sahara]

Thank you for the reply.

The light came back on...

Replaced the upstream bank 1 O2 sensor ... 150kms and no light.. Wish me luck!