But this post will concentrate on why you should seek out this diagnostic information before you tackle problems you believe are associated with fuel injection.
The self diagnostic modes of these systems are designed to help in diagnosis when problems are experienced. Unfortunately when a problem does surface many driveway mechanics feel as if the problem will most likely be traced back to the car's computer. But in my opinion the vast majority of fuel injection problems are found in places other than the computer.
Check the basic systems first
These items can be checked even before you purchase a factory repair diagram that contains the diagnostic tree chart that will help keep you on track. Some of the things to check would be that the battery is in good condition and fully charged with clean terminals and connections with no corrosion build up on system grounds.
Checking the fluid levels such as the engine oil level and the level and condition of the coolant is also a basic check that only takes a few minutes if that. When fuel injection problems are suspected it is also a good idea to check that the gasoline in the tank is in good shape and has not been substantially diluted with alcohol or water. I wrote an article on my other blog that provides information on how to test fuel quality.
In the end it is possible that there is a problem with the computer and its network of sensors. In my opinion it is probably slightly less likely than uncovering problems with basic systems such as dirty air filters, clogged fuel filters or worn spark plugs. But nevertheless it is still possible. I had an automotive instructor that used to say the best way to approach problems on modern vehicles is to treat it as if it didn't have any computers or sensors.
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