2006 Chevrolet Impala LTZ 4dr Sedan (3.9L 6cyl 4A)
I just (thankfully) traded in my 2006 Chevrolet Impala LTZ that I had for 3 years. It was a complete nightmare.
I replaced the power steering pump twice, and had the power steering service four or five times on top of that.
When the weather got cold, the power steering pump would "pressurize" and blow the hose right off, leaking power steering fluid all over the ground. The dealership charged me several hundred dollars to "fix" it, but by the time I traded it in several months later, the power steering pump was making a grinding noise again.
Other than these problems, the car was very nice. It handled well, and has plenty of power for passing or moving in traffic.
-3.9L V6 (LTZ model) provided lots of power.
-Bose sound system was phenomenal, even with factory head unit.