Two problems related to car stall have been reported for the 2006 Lexus IS250. The most recently reported issues are listed below.
I have a 2006 Lexus Is250. I noticed "rough" starts and idle. This was at or around 65k miles. I assumed it was related to super cold weather or "bad" gas (after the car sat unused for 2-3 days+) at around 84k miles during warm weather - I experienced both a rough start and stalling at a stop sign. I took the vehicle into my local dealership where it has been meticulously maintained. They did an extended diagnostic (kept the car over a long weekend) and advised my car was not "firing" 65-85% of the time and that it was caused by the valve springs. This is a $5,000 repair. Lexus claimed because the issue was outside the 70k mike warranty they would pay for the "parts" of roughly $4,000 as "goodwill" but I would be responsible for the labor at $945. I did a search for recalls and learned that the exact issue is under recall for other models inclusive of the is350 v6 - which the company regularly refers to as my car's "sibling" and has shared previous recalls with. I've contacted Lexus directly and they have advised the offer is final. They have refused my request to speak with the manufacturing rep. I believe this "stall" issue is a significant safety concern (per the recall noted) I've asked Lexus whether or not they have researched this issue on the v6 250 for which I've not received a response. I believe that Lexus would have used the exact same manufacturer for these value springs and or very similar design specifications. It is incomprehensible that given this specific diagnosis they would not resolve this immediately. I believe absent a NHTSA investigation Lexus will continue to hold customers hostage to pay for their safety although every indication is that this is a design/manufacturing defect for this model as well.
The contact owns a 2006 Lexus Is250. The contact was driving approximately 70 mph when the vehicle stalled without warning. The vehicle was able to restart and was taken to a dealer where they advised the contact that they were unable to diagnose the failure. The vehicle was not repaired. The failure mileage was approximately 78,000. The VIN was unavailable.