RX400h

You may want to ask the dealership parts department person to identify the relays by looking at the digital assembly to which that person has access. 

Greetings, Marc. Did the dealership reboot the system? You can do this by disconnecting the negative battery terminal and waiting for 30 seconds before reconnecting it.

I found several potential causes:

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1. Low coolant level or air in the cooling system: If the cooling system is not full and bled properly, the water pump will not be able to push the coolant around the system efficiently. This can cause the heater to stop working properly. You can check the coolant level in the coolant overflow reservoir and if it’s low, refill it¹.

2. Clogged heater core: Over time, the heater core can begin to rust or mineral deposits can form in these channels, blocking the flow of the coolant. You can check if the heater core is clogged by locating the two rubber hoses that connect to the heater core through the firewall area. After the engine has warmed up, feel both the rubber lines going in and out of the heater core. Both should be hot. If one is hot and the other is cold, you have a plugged heater core¹.

3. Bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction: These are some other potential causes that could lead to the heater not working properly

I found this, but one version listed a 2011 ES 350 and the other, a 2008.

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The horn relay for a 2008 Lexus ES350 is located in the engine compartment fuse/relay block. This fuse/relay block is situated on the left front of the engine compartment, right next to the battery¹. To access it, you need to remove the lid of the relay/fuse block and pull the relay straight out¹. It’s also worth noting that typically, relays can be found under the steering wheel on the left-hand side². Always remember to disconnect the vehicle’s battery before starting the replacement².

Wider tires will not help on wet roads. The grip you get is related to the tire design.  For example, look at this rating sheet and specifically, the category labeled "Hydroplaning resistance" A couple of tires are rated higher than all the others.

 

The cost to replace the starter on your 2002 Lexus ES 300 can vary depending on your location and the service provider. Here are some estimates:

• According to YourMechanic, the average cost for a Lexus ES300 Car Starter Repair is $241, with $146 for parts and $95 for labor.
• RepairSmith estimates the cost for a 2002 Lexus ES300 starter replacement to be between $265 - $323.

Please note that these are just estimates and the actual cost may vary. It’s always a good idea to get a few quotes from different service providers to ensure you’re getting the best price.

Among the potential causes of non-compliant NOx readings are:

Misfire condition
Malfunctioning or improperly adjusted EGR valve
Failed oxygen sensor
Leak in exhaust tubing upstream of converter
Excessive carbon deposits in combustion chamber
Improper spark advance
Blocked coolant passage
Overly lean air-fuel mixture
Damaged cold air duct
Failed or malfunctioning catalytic converter
Corroded or damaged engine sensor electrical connections

Please note that while a failed catalytic converter will contribute to high NOx readings, the failure in itself may have been caused by some other upstream performance problem. In all cases, it is crucial to identify the root cause of the problem before blaming the converter.

Alex, do you have a factory service manual. It should have a nice troubleshooting section with step-by-step testing procedures.

What model of vehicle do you have?

The bypass hose in a 2003 Lexus ES 300 is part of the vehicle’s cooling system. It plays a crucial role in the circulation of coolant. If your Lexus ES 300 has been either leaking coolant or overheating, you could have a faulty cooling system bypass line¹. The bypass hose ensures that the coolant bypasses the radiator and flows directly into the engine, which allows the engine to reach its operating temperature more quickly. This is particularly useful in cold weather, as it helps the vehicle’s heater to warm up more quickly. If the bypass hose is damaged or malfunctioning, it could lead to issues with engine temperature regulation. It’s always recommended to replace a faulty coolant hose with a genuine Lexus part.

So if your engine is leaking coolant at a rapid pace, you may not want to drive it to the dealership.

I would call Lexus customer service to verify. I always thought that it was 10 years from original owner's date of purchase.

Our Lexus is 18+ years old and up until two years ago, was used every day. The leather seats are still fine. When I bought a used Mazda Miata, 13 years ago, there was a tear in the driver's fabric seat. The owner told me that it was his fault, since he had something in his back pocket that cause the damage.

Perhaps your dealership suspected that a person was the cause of the tear and not simply because the seat was worn thin enough to tear.

Have you already checked rockauto.com?

I've been adding Chevron Techron at every oil change. It should help to keep the valves clean. So far, no problems.

Is your battery okay? How old is it?

It doesn't look normal, based upon photos such as this one.

Hello, Allen.

So what was the service person's suggestion as to how this omission will be resolved? Perhaps it need to go "up the ladder". 

I think you really need to go to an alignment shop that also is very familiar with and can replace suspension components. Our RX400h has a worn-out control arm bushing that may be affecting its alignment.

So there is no coolant in the oil? Does the car smoke all the time?

Are you saying that it TILTS to the right or STEERS to the right?

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VSC is an acronym for vehicle stability control; it is found in Toyota and Lexus cars. It functions to keep the car under control in harsh conditions when driving or cornering.  VSC helps regulate engine speed and brake to avoid skidding.

Neutral doesn't work? I'm not sure why you would want to disable VSC.

Did I mention this?.....
I don't like the fact that our governments plan to force us to buy EVs. I wouldn't mind having one, as we already have solar panels and don't pay for electricity, but I think we should be able to choose what we drive (within reason).

42 minutes ago, Lexus-CT said:

Around year 2000 Toyota told importer of the brand that new cars would have UV protection in their windows in order to prevent skin cancer for their customers.

2017 models still have only protection in the windshields. Just like most other car companies have had in their cars since 1990. Side windows are protected by glass and nothing else, meaning not at all.

Taxi and truck drivers are often having skin cancer in the hand near the side window (in UK right hand and US and here in left hand).

I had Llumar foil on all windows when we bought the car, except windshield (also sun roof window) and now a rather long time after still look like new. Scratch proof; installer showed me on a test window that scratching with a car key nothing happened to the foil. Have an UV detector and even when UV is 12 outside inside the foiled windows UV is 0.

Clear on the front doors and slightly tinted on rear windows - https://llumar.com/emea/en/automotive/window-tint/clear/

That's good to know, thanks!

9 minutes ago, dcfish said:

I don't like all the useless tech on cars....

Which ones? I like radar cruise and backup alerts to cross traffic.

Being in Southern California, I have to try hard to limit my sun exposure. That's why I bought a Schwinn stationary bike. On alternate days, my wife and I walk. Vitamin C is said to protect skin from UV rays, so I take a 500mg tablet, twice a day.

Having an MX5 Miata does expose me to sun, also but my rides are no more than 20 minutes.