I have been posting lately regarding my Cat. and O2 sensor issues, while the mechanic did the diagnostic, he also noticed negative fuel trim, I think this means my truck is running too rich based on my research of this subject, is this something critical that I need him to trace the problem or what could be causing it since the truck is there at the shop getting new O2 sensors. Hope new sensors would take care of this issue.
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I went searching because I'm only use to wideband sensor info that I always read in A/F ratios.
Anyway, if you didn't know all this stuff in this link, it's a worthwhile read.
Fuel Trim?
Anyway, if you didn't know all this stuff in this link, it's a worthwhile read.
Fuel Trim?
