Gediredi

Parking sensor issue

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At 4500 miles usage so far.

Last week when it started raining heavily I was driving back from London to Manchester. 3/4 of the way home the message "Clean parking sensors - parking assist inoperative" came up - with annoying beeps. I stopped and wiped all the sensors - made no difference. Did it all day Thursday and Friday. When turning the engine off it would re-set and then appear again. Visual inspection - all sensors look ok. Took it through the car wash at the weekend and it seemed to cure it - but it came back again yesterday. This morning set off and within 10 feet the same message appeared then disappeared a couple of minutes later.

Anyone else had any issues like this? On my IS300h which I had for 4 years this only happened a handful of times in total and it was always a leaf or some such stuck on the sensor.

Anyway I have phoned the Local Lexus dealer and they will look at it tomorrow - will let you all know.

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On 6/13/2019 at 4:11 PM, Gediredi said:

At 4500 miles usage so far.

Last week when it started raining heavily I was driving back from London to Manchester. 3/4 of the way home the message "Clean parking sensors - parking assist inoperative" came up - with annoying beeps. I stopped and wiped all the sensors - made no difference. Did it all day Thursday and Friday. When turning the engine off it would re-set and then appear again. Visual inspection - all sensors look ok. Took it through the car wash at the weekend and it seemed to cure it - but it came back again yesterday. This morning set off and within 10 feet the same message appeared then disappeared a couple of minutes later.

Anyone else had any issues like this? On my IS300h which I had for 4 years this only happened a handful of times in total and it was always a leaf or some such stuck on the sensor.

Anyway I have phoned the Local Lexus dealer and they will look at it tomorrow - will let you all know.

Sounds like there might be a faulty sensor which usually throws up these kind of messages. 

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Or a spider?

Web obscures sensor, web is removed when washed/car wash, ok for a bit until spider re-spins its web?

It's amazing how resilient spiders can be even through car washes and jet washes etc.

More likely a faulty sensor I suppose but it's worth bearing in mind.

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I have exactly the same problem with a new UX250h. It first occurred one day last month and cleared itself after about 30 minutes driving. Then it started again one morning last as I left home and continued for two days during which it rained more or less continuously. I dried/cleaned all the sensors several times but it never cleared the fault. The dealer (Chester) kindly took it straight in and investigated when I called in to ask about it. All they were able to do was narrow it down to the front sensors and are reporting it to Lexus as a possible new model type fault. It definitely seems related to heavy rain but this week's episode started after it had just been standing out in the rain all night. I have searched on Google and there seem to be a few other examples on various models with this latest system. Some suggest that it might be due to the application of Supaguard or clear coat (mine does have Supaguard) to the sensors. It's fine at the moment but waiting for the next rainstorm to see what happens.

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1 hour ago, johnno said:

I have exactly the same problem with a new UX250h. It first occurred one day last month and cleared itself after about 30 minutes driving. Then it started again one morning last as I left home and continued for two days during which it rained more or less continuously. I dried/cleaned all the sensors several times but it never cleared the fault. The dealer (Chester) kindly took it straight in and investigated when I called in to ask about it. All they were able to do was narrow it down to the front sensors and are reporting it to Lexus as a possible new model type fault. It definitely seems related to heavy rain but this week's episode started after it had just been standing out in the rain all night. I have searched on Google and there seem to be a few other examples on various models with this latest system. Some suggest that it might be due to the application of Supaguard or clear coat (mine does have Supaguard) to the sensors. It's fine at the moment but waiting for the next rainstorm to see what happens.

Unlikely to be due to supaguard as even waxing your vehicle would then cause a similiar issue. 

Most likely to be faulty sensors. I remember a few reports of the same thing happening on some early 3RXs

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48 minutes ago, rayaans said:

Unlikely to be due to supaguard as even waxing your vehicle would then cause a similiar issue. 

Most likely to be faulty sensors. I remember a few reports of the same thing happening on some early 3RXs

Hi Rayanns, you may be correct. For your info, one of the reports said that the card coatings had taken some flexibility out of the rubber sensor seals and this causes the ultrasonic sensor to not operate correctly. No idea if this is right or not!!

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Just an update.. got an unexpected call from head office so couldn't make the appointment with the dealer. It wasn't raining anyway and the sensors weren't playing up. However I noticed today I was parking up with the front end against some bushes and sensor three (i.e. sat in the drivers seat and looking at the display  you see 4 sensor zones on the front number 3 counting from left to right) was showing red when the others where yellow. This was the one that showed totally red briefly when it was raining heavily.  It also briefly flicked on and off whilst driving yesterday. Pretty sure that sensor three is faulty / over sensitive.

However I'm off down south again tomorrow, will try to take it in again towards the end of the week 

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I had a similar problem with an RX back in 2015.

This is the feedback I got from the dealer at the time, which may be of interest:

The sensors are made of three main parts. An outer ring, a small disc (the sensor), and in between a rubber ring. The sensor works in a way that similar to a sonar, sending and receiving sound waves. The rubber ring around it allows the sensor to register the tiny vibrations from incoming sound waves. When the 3G glass coat (clear coat protection) was applied to my car, it was also applied over the sensors and surrounding rubber ring. Over time, the 3G glass coat hardened to such an extent that the rubber ring became completely rigid, thus preventing any kind of movement., hence confusing the system.

The sensors were removed, dismantled and thoroughly cleaned so as to remove all trace of the clear coat, and then re-installed.

No problem was experienced after this.

 

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Hi all.

Its not really rained heavily since so not been too much of a problem.

However attached is a photo showing the effect I described - when parking and for example a bush or wall is in front I get this effect. Sensor 3 shows red and the others yellow. This is the one that when it was raining randomly turned completely red like I was touching a brick wall with the front bumper while I was driving down the road! and all the other sensors were unaffected.

Must be a faulty sensor in my eyes!

Brings me to another point - service at the Lexus dealer. I go to Lexus Stockport - part of RRG group. I took my IS300h there for 4 years previous so I can speak from some experience.

Despite Lexus winning awards and being proud of their service I feel the service at Stockport is poor and really I had a better experience at Volkswagen dealers previously.

With this latest episode I phoned them and they said they were too busy to look at it this week and maybe they could next week! I offered to send them the photo - not interested.

I've had previous with them before and they certainly know my name lets put it that way.

My IS had a permanent noise like a bearing was going in the front wheel - everyone (and I mean everyone!) who got in it would ask me if a bearing was going - they flat out told me several times they couldn't hear it and it was normal - implied I was hearing things.

So -maybe- next week if they can be bothered - I will take it in and they will investigate - fully expecting to be fobbed off to be honest.

Carsensor.jpg

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Is Stockport your only option? - Another dealer might be more helpful.

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Yes sensor sounds faulty. Picture doesn't really prove anything so no use to anyone other than being a visual aid.

Ive used Lexus Stockport for servicing and sales multiple times, never had any issues. They are actually the 2nd best rated Lexus dealer in the UK according to customers after Lexus Stoke I believe

However. I know they do get extremely busy - I used to book services atleast a month in advance just to get the date and courtesy car that I wanted.

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Just an update.. it's never happened again. Sensor 3 does seem a tad more sensitive than the others but not had a problem since that time reported here and it's for sure rained a lot since then.

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Have had a similar experience with my NX and always after heavy rain but appears to cure itself after a couple of miles. 

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