o2 sensor troubleshooting

Hey all, I have a bit of a niche question. So I have 07 FZ-FE Cruiser from Dubai. I have been having real issues with fuel mileage and a bit of a shaky idle. So I have been trying to do some diagnostics on it and it came up that the upstream sensor on bank 1 was having issues. So I ordered the...

Hello team, My name is Josh and have followed IH8MUD since high school when I got a '90 FJ62. Recently got into a 100 series though, so thanks for being here! I've seen a few threads about threshold error codes with multitudes of suggested fixes, bypasses, and hacks. So I apologize for any...

Hi, I just replaced my catalytic converters (both) and installed new ones. My question is, there are 4 exhaust pipe sensors O2 and Air fuel mixture sensors (i think thats what its called), do i need to replace them with new ones or do i clean them using the ultrasonic machine (which cleans the...

Driving myself crazy with this one, as it's causing me to get a whopping 8 MPG. Consistent P0125 code with intermittent P0130 and P0133. FSM points to a bad O2 sensor, wiring to the O2 sensor, or bad ECU. Replaced sensor with Denso, no change. When I run my scanner, I'm not picking up any...