I think you understand service writers/managers are not mechanics, nor do they have the mechanical expertise or knowledge of a certified mechanic. They relay what the mechanic has to say about a particular issue or situation. Service writers sell/push particular programs offered by the dealership, in order to help the dealership to remain profitable. For example; I got my sons Kia Rio Serviced and they recommended that I have and Injection Induction Flush. This included; 1 bottle of Throttle Body Cleaner, 1 12 oz Bottle of Chevron Techron Fuel Additive. The bottle of TB cleaner was $10.00 and the Chevron Techron was $20.00.
One of the reasons I had it done was, my son doesn't take great care of his vehicles. The other is the Kia Rio doesn't have a fuel filter. There total cost was 116.99 for the particular service, of which was nearly half the cost of the total service of $285.08. Now, understanding I love my son and feel better about the condition of his car, I am satisfied. It doesn't negate the cost of the bottle of Chevron at $20.00 or the labor at $99.00 for the particular service or the overall cost. I had the opportunity to say no and did at first, but later thought about it and knew I wouldn't have time to do it myself. So, I had them do so in my stead. I don't have to be concerned about my vehicles, as they are covered under their Platinum Service Program.
Well, what does all this mean; well the dealership service underwriters sell you services rather needed or not. They're not experts or auto mechanics by a long shot, they're service underwriters (sellers of auto services.) If there is an actual mechanical or electronic issue that's causing a problem, it has to be diagnosed by an ASE certified mechanic who is employed at the dealership who advises the service underwriter.
The same if you go into a friendly auto mechanics shop. They're the service underwriters and the mechanic wrapped into one. Keeping in mind, not all mechanics are honest ones and not necessarily ones that claim to be in videos on You Tube. For who's benefit do they make such videos, our's or theirs? I'll let you determine this for yourself.
Yonson did purchase his from Tire Rack and I don't believe his telling you a story either. Keep in mind I appreciate your questions and input but sometimes, it's not as difficult as we tend to make it. If the ECU picked up the pressure reading from the sensors he installed after 1/4 mile, I might be inclined to say they programed themselves. Now does this mean they are utilizing the correct TPMS reg number, I don't know but it they are working none the less. Most certainly, they're being read by the ECU with the current pressure reading. Keeping in mind the ECU reads the most current pressure reading being sent to it by the TPMS. If it didn't, then the system it self might be faulty.:smile: