I have a 97 with the 2.3 Lima. I had an engine light and the code was for the front O2 sensor. I replaced it and reset the light, but it came back on after driving about 20 minutes. I read that the MAF could actually be the root of the problem. Anyone else have any experience with this? I just don’t want to start throwing parts at it. It also is weak. Barely run 65.

 

What's the actual code?

 

+1 ^^^

What was the EXACT code number

This is just a FEW of possible upstream O2 codes

P0130 02 Sensor Circuit Malfunction (Bank I Sensor 1)
P0131 02 Sensor Circuit Low Voltage (Bank I Sensor I)
P0132 02 Sensor Circuit High Voltage (Bank I Sensor 1)
P0133 02 Sensor Circuit Slow Response (Bank 1 Sensor 1)
P0134 02 Sensor Circuit No Activity Detected (Bank I Sensor 1)
P0135 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

There are about 10 more codes directly referencing that one O2 sensor, and then many more that can CAUSE these O2 codes

Full list of codes here: https://www.therangerstation.com/tec...II_codes.shtml