Quote:
Originally Posted by JohnR
Or get a Scan Gauge and reap the benefit of a fuel computer and reading codes 
But knowing the codes is still only a small part of diagnosing problems. All the codes do is point you in the direction of the problem. There still needs to be some analysis to determine the problem and the success of that will vary by technician and circumstance. Otherwise every $10/hour lube tech could fix issues with replacing O2 sensors |
Correct John, anyone can replace an O2 sensor ,but when the light comes back on they can't find the cause of why the O2 is running rich/lean, or verify power,ground and reference circuits. Newer technology creates new challenges for technicians everywhere. There is access to wiring diagrams available but the independant shops have to pay for it, most of them do have it,the problem is circuitry is increasingly difficult to understand your average "lube tech" or independant mechanic has no comprehension of potentiometers or high speed communications systems in vehicles. Most electrical connectors are made with terminals at .064" so the days of jamming a test light in a plug to check for signal are long gone. We get alot of vehicles here the owner or an independant has tried to diagnose, we need to repair the damage they caused before actually getting to what is wrong with the vehicle. This is a classic case of "a little knowledge doing alot of harm"