Toyota 8FGU25 fault codes, DISCUSSION FORUM Feb 11, 2016Toyota 8FGU25 fault codes. This is a discussion in the forum Lifting machines, a forum for questions, experiences and comparison of forklift equipment . Email. Password Forgotten? Remember me . Marketplace NEW! Business Directory Discussion Turned out to be a bad wire harness. Toyota Parts | Toyota Engine Trouble Codes & Diagnostics Common Toyota Engine Trouble Codes (and What They Mean) When that alarming warning light on your dash illuminates to alert you to "service engine soon" or "check engine", your Toyota is trying to tell you something. A light on the dash signifies that your Toyota's engine control module, or ECM, has logged a problem.