ok so this is kind of a weird one my check engine light is on so i ran the codes and it came up with code 25 which is the air fuel ratio lean and also code 26 which is the air fuel ratio rich. how is this possible? i have a toyota repair manual and it says both could be related to the o2 sensor. does anyone have any ideas. only mods are a clamp on filter. p/s sometimes the light will go off but say it sits overnight and when i get in in the morning and start driving the light will come on as the truck warms up which also leads me towards be o2 sensor. any help would be so greatly appreciated thanks
Jeremy.