A defective set of spark plugs with certain model year 2023 Toyota GR86 to have premature failure. While driving at highway speed spark plug blew up resulting in a cylinder 4 misfire and loss of drivability. The service advisor from the Toyota dealership unofficially confirmed this has happened to multiple other gr86 models. Along with being unofficially confirmed by an aftermarket specialist. Original diagnostic from the dealership was to replace the motor due to all of the issues, while a local certified mechanic has replaced the spark plug, coil pack, and is continuing to troubleshoot as the head gasket also needs to be replaced. No warnings lights or signs were present prior to failure.

The contact owns a 2023 Toyota GR86. The contact stated that while driving 80 MPH, the engine blew up, causing the vehicle to stall, and there was a significant amount of smoke coming from underneath the hood. The message "Engine Misfire" was displayed. The contact was able to pull over to the side of the road. The contact stated that engine oil had leaked out and spread underneath the hood, and the oil was leaking onto the ground. The vehicle was towed to the dealer, where it remained for 8 months, and the contact was informed that there was sludge in the oil due to lack of maintenance. The dealer sent diagnostic pictures to an unauthorized party, who forwarded the pictures to the contact. However, the contact stated that the engine oil color was amber, and there was no sludge. The contacted stated that the diagnostic pictures also displayed fragments of a piston and a lifter in the oil pan. The contact contacted the Police, who arrived at the dealer with the contact and forced the dealer to release the vehicle with the service reports. The contact stated that the dealer had previously refused to disclose the diagnostic information. Additionally, the contact stated that the vehicle was returned to the owner the same month the warranty had expired. The dealer determined that the engine needed to be replaced, but the vehicle was not repaired. The manufacturer was notified of the failure but denied the warranty coverage. The failure mileage was 35,053.

I was driving on US Hwy 89 in Arizona when the engine lost power at 60mph and was unable to restart after pulling over to the shoulder of the highway. There were no warning lights or indicators whatsoever. When the vehicle came to a stop, the entire dashboard lit up and the engine cut out while the vehicle was still on. Mechanic diagnostic found a thrown bearing and total engine failure due to low oil. Refused warranty on account of taking the vehicle to an oil change outside the dealership.

There are two fuel lines on each side of the engine bay, driver and passenger going into the injector rails. One of the fuel lines on the driver side is rubbing on the underside of the hood, when closed, causing marks, and potentially a burst on a fuel lines, causing fires. The fuel line on my car has rub marks, and visually “wearing it down”. No bursts, yet. There has been about 10-15 cases of GR86/BRZ (essentially the same car), with fires starting randomly from the engine bay on the driver side, rising the chances of this being a reality, and a VERY SERIOUS issue with these cars. And with this issue arising from FB groups, many other owners have come forward and confirmed the same rubbing marks on the same fuel line, or even in both on the same side instead of just the one.

Fuel lines in the engine bay are rubbing against the hood insulation and wearing down. The first generation GR86 fuel lines had sleeves compared to the second generation..