BenBad

I need help. I own a 95 ls400. Purchased it in 8/2020 and it was driving fine with no warning lights. I finally decided to get a tune up and have the timing belt done as well. When I got the car back, I drove around and suddenly the traction control light begins to flash and CEL as well. I made it halfway home and had to get it towed since the car stalled out. My mechanic goes through the car again and says that the valves on the left side were bad and that I needed a new knock sensor. Did the valve work , both knock sensors and Replaced the starter as well since the manifold was taken apart. Get the car back, again......Traction control light is still flashing and the CEL p0330 knock sensor. How can that be? I just replaced it. This time, the car will not shift gears while driving. Replaced the ECU and still the problem continues. I’m beginning to think that my mechanic has no idea what he’s doing. Help !!! The car only has 170,000 miles.