2005 jeep wrangler x

My '05 TJ started slipping out of gear. It's an automatic. She has 130,000 miles. She's going through a wear cycle and has many codes: ----- P0871 - Overdrive hydraulic pressure switch circuit. P2096 - Downstream post catalyst fuel trim system 1 lean. (TSB?) P2098 - Downstream post catalyst...

Hi. Im a newbie here and a First time Jeep Owner. I have a 2005 Jeep wrangler 6 speed 4.0L and my engine light JUST came on today. :cry: The guages all look normal but obviously theres something needing attention. My question is, where do I start on finding out where the issue is? I know I can...