RX400h

That may be a failing brake booster check valve. This page shows where it is located. It looks to be fairly easy to replace. 2015 Lexus RX 350 Power Brake Booster Check Valve - 4473022150 - Genuine Lexus Part The part itself is less than $45.

Happy Thanksgiving! It's 9:00 AM and already 72 degrees here. Needless to say, it'll be a wonderful day.🙂

Good idea 👍

With only 35K miles on the fluid, I would think that a simple drain and fill would be fine. In the past, I would do a second drain and fill, 1-2 months after the first. Is there an interval specified in your owner's manual?

I would've questioned why they did not clean or replace the connector, first. If that didn't solve the problem, then perhaps replacing the DCM was the only other option. I would call the service manager and ask him that very question. I once had an issue with an Electronic Body Control Module in a 2001 Corvette. I simply unplugged and plugged in its connector, multiple times to solve the issue.

Perhaps a good first move.

Did you call KYB? There's always a chance that they are defective. Call them and describe the ride characteristics.

What is the code reading? There is lots of information out there about codes and repair costs. How many miles are on your odometer and what is the driving mix of city and highway?

I mistakenly bought an aftermarket set before replacing ours (older generation than yours). Here's my story:

I wonder if a passenger can scan for codes while you are driving 80+ MPH. I have read owners of German cars reporting the same thing. Those replying, suggest a speed sensor or ABS module as possible culprits.

I would take it in to the dealership for inspection. If it were an older vehicle, I'd suspect a loose connection or faulty sensor.

I had KYB shocks on my 1989 Mazda MX6 GT and they were perfectly fine. Did you verify that you received two fronts and two rears and that they were installed in the right locations? I would call KYB and explain the situation to solicit their opinion. One of my brothers had Tokiko struts installed on his Honda Prelude, but they were very stiff - much more so that the OEM struts. It is never a good idea to install different brands from front to rear or side to side, just as you should not do that with tires. O

Have you tried turning off and then starting your vehicle? Based upon what I have read, if the condition remains, check or have someone the 30-amp fuses in the engine bay fuse box. If they are good, the amplifier may have failed.

Those look like reasonable costs compared to what a dealership would charge.

This post may be relevant. Different vehicle but similar symptoms

Hello, Felix. What have you done so far? Checked the transmission fluid level? Checked for any codes using the OBD2 port? Checked to see when the fluid should be changed?

If you don't get an answer here, consider (if you haven't already) calling or emailing the company that developed the turbo. I would expect them to be very knowledgeable about the limitations and possible upgrades.

Thanks, Les. That's what I thought. 👍

Wow, I think they need to enhance their training routine for such personnel! 😏

Certainly; we typically try to combine trips to save on fuel.

That's good that he encouraged using math for real-life use. I recall in the early 2000s, speaking with RX330 owners who told me they were averaging 18-20 MPG, depending upon the ratio of highway to city driving. I think even Consumer Reports listed that vehicle as having an average fuel mileage of 19. Ours has always been about 25-27 with a mixture of highway and city driving, but then again, it's a hybrid. The new Toyota Sienna hybrid vans are averaging about 30 MPG - fantastic for such a large vehicle that is not the best, aerodynamically-speaking.

I wonder if Lexus customer service would be able to verify. My guess is that it would, to avoid liability issues.

That's perplexing. Our all-wheel drive system is certainly newer and configured differently, since it is a hybrid. What fuel mileage was he getting on average? Did he ever check by looking at the odometer and gallons to fillup?

From mechanic Tim Charlet: Typically a jerking sensation you are describing is due to a fuel or air restriction in the fuel system, possible caused by a damaged or incredibly dirty mass air flow sensor, throttle body or fuel injectors. However, the first question I’d ask was - when was the last time the transmission fluid was changed and filter replaced? Overtime, the transmission fluid and filter debris can become stuck in the hydraulic lines of the transmission and cause similar symptoms. It’s also common for these symptoms to be more noticeable when the vehicle is at operating temperature.

Toyota Plans to Deploy Automatic Engine Shut Off and Automatic Park Features to Vehicle Line Up - Toyota USA Newsroom (published in 2019)