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Just to clarify that the car has niggles rather than its owner! Although the case is arguable, i'm sure...

Good evening,

My partner and I have very recently changed our daily car to a 2007 RX 400h SE, it has 105000 miles and almost a full service history, with the 100k service done at a Lexus dealer at the end of 2018. It's great! It's quiet, comfortable and quick when required - a very welcome change from the previous Kia Venga 1,4CRDI, and although it is an older and higher mileage car, it is pretty much better in every way (except fuel consumption, i'm sure!).

The car is in very good condition, it was on the cheaper end of the market and the test drive went beautifully. hence we bought it. However, there are a couple of niggles i'd like to sort, and hopefully get some advice on from the resident sages on here! I'm by no means a mechanic but have fiddled with classics and usually service our vehicles, so if the work is DIYable to the lazy and questionably capable then i'd have a go!

Firstly, there is a definitely audible whine at light throttle that increases pitch with speed, it goes away when coasting and I don't think it's present at medium/full throttle. It also disappears in neutral, (but that is effectively coasting). Im quite sure it can be felt through the steering wheel and souynds/feels like it's from the front (but I know these things can be deceptive), here's hoping it's a wheel bearing and not a gearbox issue! I think the gearbox was serviced with the 100k service back in 2018, but haven't checked for leaks or fluid levels. At first I thought it was just a hybrid noise, but I think it is too intrusive.

Secondly, and I haven't experienced this as it seems to only occur from cold, there is a jerking feel to the car in the first couple of minutes of driving, not a vibration, more like a rythmic jerk, or clunk. There was an advisory on the last 2 MOTs that the offside rear ARB pin/bush was worn but not resulting in excessive movement, I plan to resolve this advisory anyway but could this be releated? Or perhaps a more sinister drivetrain/gearbox issue.

Perhaps worth noting, one of the rear tyres is new and the bordering illegal, heavens knows why they weren't replaced as a pair! At the beginning of 2019 it also had a hybrid health check, which it passed.

I would very much appreciate your thoughts on these points, and general 400h comments! Being new to the fold it will take a little while to get to know the car, it's features and foibles, there are many after all! I thought the car was an SE-L, however this is registered as an SE, but has DVD screens in the seats and a sunroof. I will see if I can get a photo of it, the advert ones were not great and it's so dark all the time just now.

Tom.

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If you bought from a dealer take it back under warranty for them to sort!

I would say get the gearbox oil changed and go from there, also check the gearbox mount. Then get it on a ramp and check for play in bushes etc.

I doubt unless asked for a gearbox drain/refill, if Lexus would of done it. Also check brakes for sticking.

James.

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The oddly worn tyres could be a factor. Not having 4 even tyres can have wheels rotating at slightly different speeds and wind up parts of the drivetrain enough to push gears into each other and cause mild vibration or gear noise like a sight whine. Not an easy thing to check though unless you're prepared to go to the expense of fitting 4 identical tyres. .

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1 hour ago, JamesIS220 said:

If you bought from a dealer take it back under warranty for them to sort!

I would say get the gearbox oil changed and go from there, also check the gearbox mount. Then get it on a ramp and check for play in bushes etc.

I doubt unless asked for a gearbox drain/refill, if Lexus would of done it. Also check brakes for sticking.

James.

Welcome Tom.

I agree with the first line of James` response to you.

If you did buy from a Dealer , Do not however, follow his advice in his next paragraph,,,,,,, lest the Dealer  disowns the car claiming that you have done something that has caused your niggle(s).

If you bought the car privately, then take it to your Lexus Dealer and obtain a quotation for remedying such problems as they find. Then report back to the Forum with the findings so that we can advise you further.

Good luck.

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Regarding tyres, my first RX suffered from a worn wheel bearing type noise. Dunlop  Sport Maxx tyres wear in a strange way and are known to cause this sort of whine. They were on the rear of my car and changing them cured the noise. 

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I would be thinking gearbox or diff if you can feel something and you have 'jerking', and the whine goes away in neutral.

On the other hand the feeling could be just tyre wear.

Wondering if it could be water pump whining away?

 

My experience of Gearbox Oil is that it can get pretty dirty, and smelly and the transmission does not whine, but it you have low oil in the gear box, that is not a good thing.

 

I used Automatic Transmissions of Gloucester to do a proper oil replace at 130,000 miles, and they seem to know their Lexus and Jag gearboxes.   (their Google Reviews are variable), but I found them to be professional.

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Thanks for the replies and thoughts everyone, I will look into the diff and CVT oil at the weekend. As mentioned, I have a feeling it had a lot of servicing done in 2018 for the 10 year/100k main dealer service - including the gearbox oil, but will check. It's a shame there isn't a gearbox dipstick like conventional automatics.

I have read around about the gearbox oil, am I right in thinking that the dealers put more in than the position of the fill hole allows, necessitating ramps at the front to get the extra bit in?

Could the issues be brake related? Again in 2018, it had both rear calipers replaced with reconditioned units due to binding/sticking sliders. I noticed that moving off after releasing the handbrake yesterday, the rear brakes stuck on, and disengaged with a thunk at about 10 mph. perhaps i'll have the rear wheels off and see if there is an issue here too. Is 18 months a realistic time frame (with city and/or little use) for the rear calipers to start seizing again? The OH didn't notice the jerking this morning, I didn't apply the handbrake when I parked it last night - but it could mean the OH wasn't paying attention rather than it not happening!

Thanks,

Tom

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Could the whine be anything to do with the hybrid regen motors or the like, and therefore normal? I believe I have read other RX400h members on here mention just such a thing. I went to view and test drove a handful of RX400h's a couple of years ago, and I certainly noticed a slight whine which was more noticeable on on some more than on others... perhaps down to state of charge of the hybrid Battery or other variable? 

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Sticking slide pins on the rear callipers are a common problem. Not normally a need to replace the entire callipers  at a not inconsiderable cost---just remove the slide pins, clean and apply some new grease..

If the slide pins are too far gone you can but them off Ebay for a very reasonable price  https://www.ebay.co.uk/itm/Genuine-Rear-Brake-Caliper-Slide-Pin-47814-48050-Fits-Lexus-RX330-RX350-RX400/273945308834?fits=Car+Make%3ALexus%7CModel%3ARX&epid=1216788949&hash=item3fc869aea2:g:dD0AAOSwD~Fbt3MS

Whilst you are at it probably worthwhile fitting new rubber end caps as well https://www.ebay.co.uk/itm/GENUINE-BRAKE-CALIPER-SLIDE-PIN-DUST-BOOT-COVER-TOYOTA-CAMRY-LEXUS-RX-4777541030/293040972438?fits=Car+Make%3ALexus%7CModel%3ARX&epid=1516739201&hash=item443a9a6296:g:Of4AAOSwT6pVoSQS

Hope this helps 

 

 

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  • Club Hybrid Poll

  • 469 Hybrid Reliability

    1. 1. If you were to consider buying a Hybrid model over 5 years old, would you be worried about the reliability of the Hybrid system?


      • Not really as Hybrid systems are always reliable
      • Not if it had a Manufacturers Warranty on the Hybrid system
      • I would not buy a Hybrid model over 5 years old