So, this week, I was informed that Hyundai told the dealership to replace a harness and the knock sensor. They mentioned Hyundai wanted them to test the fuel system to check things and possibly replace the oxygen sensor based upon the results of the test, just in case. Yesterday I got the call that the patch harness and knock sensor were replaced, and no other replacements were required. I need to go pick up my car.
I also called the Hyundai Safety Recalls and Service Campaigns line (https://autoservice.hyundaiusa.com/C...Campaign/Index
, (855) 671-3059) and spoke to an agent who explained the details he had for the service campaign 953. The campaign is to install software to use the knock sensor to detect premature rod bearing wear. I had read that online at the service campaign website, but now that my vehicle has completed the campaign, that detailed information is no longer available. There was a pretty good FAQ attached to the campaign that I wish I had saved.
So, it seems Hyundai is looking for 2015 Sonata engine failures with this campaign, and that the failure is the same issue that they had on the 1.2 million recalled 2011-2014 models. My dealership said there is no end in sight for the replacements they have been doing on those model years.
The dealership doesn't seem to know exactly what the campaign is for, as I've never had them provide me any details about rod bearing wear when I asked about the need for the update. And, they have no explanation when I talked to them on the phone about how this patch harness and oxygen sensor replacement solves some unknown issue after installing the software update. I can speculate, but I don't have enough information to back my speculation. I hope to be able to talk to someone more informed than the service agent at the dealership when I go to pick up my vehicle.
But, thanks to this forum and the internet, I am more aware of this issue and will certainly be more closely watching my oil level and color than I have been if I decide not keep the vehicle long term.