Roger Spears

On 2/24/2011 at 4:43 AM, BGLister said:

My RX400h is coming up to 2 years old and 20,000 miles now. It is booked in for the 20K service next week.

I have recently noticed an intermittant rattle/knocking when I have been driving, but it is difficult to say where it is coming from (these things usually are difficult) except to say it is coming from deep down under the dashboard on the driver side.

This rattle/knocking noise seems to happen when driving on a coarse road surface, driving over road markings, or a cat's eye for instance. Sometimes it happens on rougher terrain such as pot holes etc, but not necessarily. It is difficult to reproduce at will, but I hear it on every journey now. This is something that I have only recently come to notice, so wondered whether something has loosened with time.

I have checked under the dasboard in the footwell area and can feel various bundles of cables and pieces of trim. Where I can find something that has the potential to rattle or knock against something else, I have wrapped butyl tape around it (anti-rattle tape). No change in that the rattle/knocking sound still happens.

As good as Lexus technicians can be (no, not always), I am hesitant to let them start pulling the interior trim to pieces as they will no doubt get scuffed/scratched/stressed and various clips would have to pulled out and go back in, probably not getting replaced. The car is in mint condition, so don't want it getting spoilt - although the knocking is getting annoying.

The other possibility is that the sound is getting transmitted up via the suspension or chassis from under the car. It does not really sound that way, but know that these things can be deceiptful. Amongst the possibilities are things like the suspension, exhaust mounts, heat shield.

So would like to ask, has anyone here encountered a similar issue with their RX, found out what the problem was, and managed to get it solved?

With thanks

Bryan

Please let me know what your issue was. 

On 2/24/2011 at 4:43 AM, BGLister said:

My RX400h is coming up to 2 years old and 20,000 miles now. It is booked in for the 20K service next week.

I have recently noticed an intermittant rattle/knocking when I have been driving, but it is difficult to say where it is coming from (these things usually are difficult) except to say it is coming from deep down under the dashboard on the driver side.

This rattle/knocking noise seems to happen when driving on a coarse road surface, driving over road markings, or a cat's eye for instance. Sometimes it happens on rougher terrain such as pot holes etc, but not necessarily. It is difficult to reproduce at will, but I hear it on every journey now. This is something that I have only recently come to notice, so wondered whether something has loosened with time.

I have checked under the dasboard in the footwell area and can feel various bundles of cables and pieces of trim. Where I can find something that has the potential to rattle or knock against something else, I have wrapped butyl tape around it (anti-rattle tape). No change in that the rattle/knocking sound still happens.

As good as Lexus technicians can be (no, not always), I am hesitant to let them start pulling the interior trim to pieces as they will no doubt get scuffed/scratched/stressed and various clips would have to pulled out and go back in, probably not getting replaced. The car is in mint condition, so don't want it getting spoilt - although the knocking is getting annoying.

The other possibility is that the sound is getting transmitted up via the suspension or chassis from under the car. It does not really sound that way, but know that these things can be deceiptful. Amongst the possibilities are things like the suspension, exhaust mounts, heat shield.

So would like to ask, has anyone here encountered a similar issue with their RX, found out what the problem was, and managed to get it solved?

With thanks

Bryan

What was your issue 

On 2/24/2011 at 4:43 AM, BGLister said:

My RX400h is coming up to 2 years old and 20,000 miles now. It is booked in for the 20K service next week.

I have recently noticed an intermittant rattle/knocking when I have been driving, but it is difficult to say where it is coming from (these things usually are difficult) except to say it is coming from deep down under the dashboard on the driver side.

This rattle/knocking noise seems to happen when driving on a coarse road surface, driving over road markings, or a cat's eye for instance. Sometimes it happens on rougher terrain such as pot holes etc, but not necessarily. It is difficult to reproduce at will, but I hear it on every journey now. This is something that I have only recently come to notice, so wondered whether something has loosened with time.

I have checked under the dasboard in the footwell area and can feel various bundles of cables and pieces of trim. Where I can find something that has the potential to rattle or knock against something else, I have wrapped butyl tape around it (anti-rattle tape). No change in that the rattle/knocking sound still happens.

As good as Lexus technicians can be (no, not always), I am hesitant to let them start pulling the interior trim to pieces as they will no doubt get scuffed/scratched/stressed and various clips would have to pulled out and go back in, probably not getting replaced. The car is in mint condition, so don't want it getting spoilt - although the knocking is getting annoying.

The other possibility is that the sound is getting transmitted up via the suspension or chassis from under the car. It does not really sound that way, but know that these things can be deceiptful. Amongst the possibilities are things like the suspension, exhaust mounts, heat shield.

So would like to ask, has anyone here encountered a similar issue with their RX, found out what the problem was, and managed to get it solved?

With thanks

Bryan

What was your issue?