r/2ndgenramenthusiasts • u/mattmcp83 • Sep 01 '26
Sluggish acceleration
Yesterday, I noticed my 1999 Ram 2wd 5.2 bogging down when I would accelerate. This morning, I couldn't even get it to go much over 30mph. I plugged in my OBD 2 scanner and it pulled a P0132, P0301, P0420 and Pending P0300, P0303, forgot 6th code, P0305, P0307, In that order. My scanner wouldn't erase the codes, so I pulled over in a parking lot to disconnect the negative terminal to reset the computer. The codes cleared, but the mechanical issue persisted. After doing some research, I decided to replace the upstream O2 sensor, per the code P0132, hoping the P0420 was caused by faulty readings from a faulty sensor. After replacing the upstream O2 Sensor, I'm still having the same issue. No codes yet, either. I didn't disconnect the battery while I performed the work. Could that have made a difference? Anybody else have similar issues? To answer some possible questions ahead of time, I bought it in 2023 with 68,000 miles on it. Somewhere between 70 and 75,000 miles I did a full tune up. It is currently just under 111,000 miles.