Lexus Rx350 Problems
Coming in the battleground of midsize luxury crossover SUVs, Lexus Rx350 was equipped with impressive high-tech features partnered with a comfortable and spacious interior. And over the years, it earned its status of being a favorite among ordinary car drivers and enthusiasts due to its notable record for reliability. However, there were some issues that Lexus needed to face and resolve, which made the Rx350 even better than ever. Here are some of the problems that Lexus Rx350 owners observed with this crossover:
Vehicle speed control
Cases have been reported about malfunctions, which are characterized by the crossover suddenly jolting into motion even when the brakes are applied. Other times, the vehicle accelerates right at the moment when the vehicle is being parked and about to be turned off. This failure is due to a stuck accelerator pedal, which remains in a partially depressed position instead of going back to its idle position. Furthermore, it was discovered that the forward retention clip holding the floor carpet cover was not properly installed, causing it to lean towards the accelerator pedal. Leaving the accelerator pedal stuck could lead to difficulty in stopping and sustaining the speed of your Rx350. A safety recall for this issue was done in March 2011.
Another apparent problem in Lexus Rx350 is the knocking sound coming from the engine, which can be considered as a typical occurrence during cold start. It may even get louder as the temperature drops due to the continuous contraction of metal while cooling. Many Rx350 owners have a misconception about this problem-that it may be caused by a defective valve or timing chain. However, what really happens is a "piston slap" wherein the pistons knock against the engine cylinder wall because of their position. It happens most especially when the pistons have not yet expanded just enough to match the cylinder sleeve.
The problem cannot actually be eliminated, but it can be minimized by coating the pistons. You can also taper the piston skirt to allow more space during the expansion of the pistons yet maintain a close distance to the cylinder.
I noticed a whirring noise in my Lexus RX350 that increases with speed. I also observed that the noise is louder from inside my SUV than from the outside. Any ideas on what this might be?
There are several possible causes for this symptom. First, your Lexus might be low on power steering fluid, which lubricates the power steering pump and power steering gear unit, among others. Check if you still have enough then refill if necessary. If you did refill it, continue monitoring the fluid level as you drive to make sure that you are not losing power steering fluid. Should that be the case, get that leak fixed as soon as possible. A second probable cause would be bad alternator bearings, which allow the rotor to spin freely inside the stator. Simply replace the entire alternator to fix this. If the first two solutions did not help, your Lexus might have a bad water pump, which circulates fluid while your vehicle's engine is running. If this component has indeed stopped working, you will need to replace the unit.
I changed the battery of my Lexus RX350 and now I can't operate the windows from the driver's master switch. How do I reset the window controls to make it work with the switch at the driver's side again?
This is a common problem for many Lexus RX vehicles especially the RX350 after changing the battery or even disconnecting it. To fix this, turn on the ignition then lower each window all the way down using their own switches and then raise them back up until the light indicators stop flashing. Do this on one window first and repeat it a couple of times, only going back to the driver's side door to test it with the master switch. Once it's working for that one window, do the same thing on the other three windows.
My Lexus RX350 has an inch-long deep-lined scratch on the back. Is there a way for me to repair the scratch without doing a complete repaint of the panel?
You can remove the scratch without needing to repaint the entire panel. Remember to work in a well-ventilated area and degrease the part you are painting with a solvent before you start. If you need to find the correct touchup, you can find the factory-paint code on the driver side door jam. It is 3 digits long and can contain letters and numbers. The "C/TR" at the bottom of the label is where the exterior color code starts, but you will only need the 3 digits after that. If you can't match the color, you can get try the dealer's parts counter or get a pint custom-mixed. When you start painting, brush in a layer of primer first, and then sand the overrun until it covers only the bottom of the scratch. Let the primer cure at least overnight. The trick here is to allow the primer and lacquer paint to dry overnight so it can shrink before you add another coat. So if you will need multiple coats to hide the scratch, painting one coat each day is best.