That is one of the frustrations of how all the manufacturer's make their diagnostics proprietary.
Don't confuse the diagnostics with the OBDII codes, that is emissions only, which does include just about every engine fault, because just about every engine malfunction will effect emissions. OBDII codes is easily accessible via the key dance or cheap scanners you can buy or go to your local auto store and have them read it for you, etc. The rest of the fault codes, in the air bags, TPMS, stereo, body computer, etc, etc, that "could" be read just as easily, but the Federal Government didn't mandate it, so all the Manufacturers make those codes proprietary and only able to be read by a very expensive tool that they make it only easy for the Stealerships to have. So they force you to go into the Stealership and pay outrageous fees for service that most people could do themselves if they just had access to the diagnostic information.
I had a TPMS light despite having good air pressure in the tires. Since I invested $500 for an AutoEnginuity Tool just for Chrysler vehicles (its pretty crappy, but it plugs into a laptop and runs their software) I was able to plug in an read the proprietary fault codes and figure out exactly what was wrong, and which sensor was bad. I complain about the tool I got, but a better tool would cost thousands of bucks. So its either pay $500 for a bottom of the barrel tool or take it to the dealership or tire shop and pay them $200-$300 for a repair I did myself for $35*.
*Keep in mind, since I'm retired military, I get to use the local base Auto-Hobby Shop, to dismount and remount and balance tires for like $4. Most folks still have to pay a tire shop $40-$75 to dismount, remount and balance a tire.
Still, I hear of folks having to pay tire shops and dealerships $200-$300 to replace one TPMS wheel sensor? You can get a brand new quality TPMS sensor for $35 online, of course there is the mounting and balancing fees for the Shop machines that can do it, but really $200-$300? that is outrageous, and again consumers being taken advantage of.
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Last edited by Mongo; 02-18-2016 at 03:45 PM.