Wats the color codes n function positions 1 to 6

If it didn't come with the original OEM air box/tunnel parts, then I would take a look at the air filter. If it is unique to the aftermarket intake system, then research the filter, if possible. You should try to ensure that the filter's filtration effectiveness is at least as good as the OEM filters. That may be difficult to do, however. Your other option is to buy the OEM intake components and filter, then swap out the aftermarket setup.

I think you meant to specify your odometer as being 60,000 miles, not 600,000 miles. A humming or "electric golf cart" type noise during acceleration is not considered normal if it is a new symptom that wasn't present when the vehicle was newer. On a 2023 RX350 F Sport (non-hybrid), some drivetrain and turbocharger noise is normal, but a pronounced hum that increases with acceleration can come from several sources: Wheel bearing wear, especially if the noise changes with vehicle speed. Tires, particularly if there is uneven tread wear or cupping. Tire noise is one of the most common causes of humming sounds around 50,000-60,000 miles. The 8-speed transmission, which can sometimes produce a whine or hum under load. The turbocharger, which naturally makes some turbine noise during acceleration, though it is usually more of a whistle than a golf cart hum. A drivetrain component such as a transfer case or differential (if AWD equipped). At 60,000 miles, I would first suspect the tires or a wheel bearing, as both are common wear-related causes of humming noises. A simple clue is whether the sound changes when turning slightly left or right at highway speeds. A failing wheel bearing will often get louder when the vehicle's weight shifts onto that corner. A few questions that would help narrow it down: Is the RX350 or RX350 AWD? Does the noise occur only when accelerating, or is it present while coasting too? Does the pitch change with engine RPM or with vehicle speed? Has the vehicle recently received a new set of tires? If the noise is truly tied to engine load and acceleration rather than road speed, the dealer may want to inspect the transmission, turbocharger, and AWD driveline components. If it tracks vehicle speed regardless of engine RPM, I'd start with the tires and wheel bearings.

That is definitely not normal behavior for a TX500h, and based on your description, Lexus appears to agree. The fact that Lexus corporate initiated a buyback discussion is a strong indication that they have not been able to identify or permanently correct the root cause after multiple repair attempts. As for whether others have experienced similar issues, there have been reports from some TX500h owners of hesitation, delayed throttle response, harsh low-speed shifting, and occasional "dead pedal" symptoms during acceleration. Some owners have also reported transmission-related concerns and power delivery irregularities in the Hybrid MAX drivetrain. However, these reports do not appear to point to a single, well-documented failure mode. [clublexus.com], [us.lexusow...rsclub.com], [go-parts.com] What stands out in your case is the length of time the vehicle was out of service. A 53-day repair attempt is extraordinary, especially when the dealer apparently installed software updates and then replaced the fuel pump without being able to verify that the pump was actually the cause. If the vehicle is now performing worse than before the repair, that suggests the underlying issue remains unresolved. The fuel-pump theory seems questionable on the surface, but it is worth noting that some owners and aftermarket technical sources have associated hesitation and power-loss complaints on the Hybrid MAX powertrain with fuel delivery concerns. That said, replacing parts without confirming a failure can sometimes turn into a process of elimination rather than a true diagnosis. [go-parts.com] At this point, I would be less concerned about finding another owner with the exact same symptom and more concerned about getting Lexus to either: Present the buyback offer they already indicated was forthcoming, or Escalate the case to a Lexus field technical specialist with a documented repair plan. If Lexus already has the vehicle documented for multiple unsuccessful repair attempts and more than 50 days out of service, you are likely in a much stronger position under your state's lemon-law provisions than many owners who are still early in the diagnostic process. I'm curious whether the stutter occurs only under light acceleration from a stop, or if it also happens during moderate acceleration at 20-40 mph. That detail could help determine whether the issue is more likely related to the Hybrid MAX powertrain controls, transmission operation, or fuel delivery.