Parking/Sonar sensor error - intermittent

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Apr 3, 2026 | 08:39 AM

dcmacg811

Thread Starter

1st Gear

Joined: Sep 2020

Posts: 1

Likes: 0

From: WA

Parking/Sonar sensor error - intermittent

RC350 F-Sport AWD 2015, 62kmiles:::: recently (March 2026) receiving Park/Sonar sensor message, "Clean Sonar Sensor" or "Clean Parking Sensors". Display shows car with * at all sensor locations, beeps for a few minutes then stops. This occurs about 9 out of 10 times on restarting the car. But every so often (1 out of 10 start ups) the sensor system will work OK. Reseting the "Park Assist" button does not clear the error. If the sensor error occurs, the system beeps for about 15 times, then goes silent. The dash displays the car symbol with the *. The center screen will display the park assist error message.

Another symptom noted that may or may not be related is that the center screen display will NOT stay on the selected screen (Home, Media, Nav, etc). Instead, after about 15 seconds it reverts to the previoius selected page. This behavior started about the same time I started getting the park/sonar sensor errors..

I have cleaned all the sensor external view ports several times without changing this behavior. Looking for any suggestions to try to resolve before I approach Lexus service and a big $$ bill.

UPDATE: The Nav screen reverting to previous is UNRELATED to Park/Sonar sensor alert. I inadverently set "Auto Screen Change" while trying to work the sensor error.

Last edited by dcmacg811; Apr 3, 2026 at 11:11 AM.

May 27, 2026 | 11:21 AM

S2KBobby

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Joined: Dec 2018

Posts: 26

Likes: 6

From: Manitoba

I hate to give you bad news but I suspect one of your sensors is wet or defective and there is no way short of going to Lexus to determine which one is the culprit.