- Joined
- Jul 15, 2008
- Messages
- 799
- Reaction score
- 4
- Points
- 0
- Age
- 36
- Location
- Sutersville Pa
- Vehicle Year
- 97,79,00,72,71
- Make / Model
- Ford
- Engine Size
- 3.0, 501, 7.3psd, 351c, 351w
- Transmission
- Manual
The vehicle is a 97 Ranger 3.0 5spd. 197K miles. The truck still runs well. I keep getting a CEL saying that P0420 Catalyst System Efficiency Below Threshold (Bank 1). Ive changed the rear oxygen sensor. I'm going to change the front two. If that does not fix that problem. Has anyone ran one of these with hollowed out cats? Does the CEL stay on? I had my cats off they still look ok but I'm not sure what else could be the problem.