This vehicle seems to have a well-documented problem with water intrusion that damages the ECU and hybrid battery. The 2006 and 2007 RX400h has the HV battery located under the seat, which is the low spot in the rear section of the car. If water is spilled or the body has a water leak, the water will pool at the center of the battery. Lexus considered this, and added a drain under the battery, but the drain has a filter, presumably to keep insects out, and the filter is easily clogged. This, coupled with a pattern problem of split body seams near the rear hatch strut mount causing a water leak in the rear of the car, has created isolation faults in many of the RX400h SUVs. The condition presents as warnings on the instrument cluster and a no-start condition where the vehicle is inoperable. A search for "lexus ECU water intrusion" brings up my vehicle's exact model and year so this is well-documented.

- Seattle, WA, USA

Transmission has a hard time selecting a gear between 2nd and 3rd. It starts to go into 3rd gear then jumps out for a second and then slams back into 3rd. Usually when lightly accelerating. Very noticeable. I have taken it into the dealer 4 times and was told I may just need a new transmission!! it only has 108,000 miles on it. I have never heard of this problem with a Lexus! that and the rear differential was diagnosed as bad as well! it's like the entire drive train is garbage!! very very disappointed with Lexus and I hope they will make this right with me. I don't want to be on a trip with my family and it break down on us when I payed for reliability.

- Alpine, UT, USA

Since we purchased this 2006 Lexus rx-330. It has been returned to deals 4-5 times for major hesitation problems.. car is unsafe to drive. Will not accelerate in a safe way.

- San Diego, CA, USA