Fuel trim data is one of the most powerful yet underused tools in automotive diagnostics. By learning to interpret short-term and long-term fuel trim readings, technicians and DIYers can spot vacuum ...

Question: I took your advice and purchased a diagnostic scanner. I’ve been playing with it and trying to make sense of some of the things on the data list. I remember you saying that the “fuel trims” ...

Q: I took your advice and purchased a diagnostic scanner. I’ve been playing with it and trying to make sense of some of the things on the data list. I remember you saying that the “fuel trims” were a ...

Hello. I've had an ongoing problem with my 2008 Corvette for over a year. I have reoccurring fault codes of P0171 and P0174, fuel trim lean on bank one and two. I have had the car to four shops and ...

From reading a check engine light to streaming live sensor data, OBD-II diagnostics give drivers and technicians a powerful window into a vehicle’s health. Choosing the right scanner, understanding ...