Squidgnat

Hi all, first post as I just purchased a new to me FWD 2013 RX350 (I freakin love it so far).

Anyway, please help as I couldn't find info in the search function.
-Yesterday, BOTH error codes popped up for the rear wheel sensors - Codes C1404 and C1408.
-The ABS, red brake light, and traction control warning lights popped up on the dash.
-Car drives and brakes fine despite the issue.

All I could do so far is visually check the rear wheel sensor harnesses and connectors, all appeared to look fine.
Any troubleshooting insight?
Thanks!
SquidGnat

RX in NC

Has the vehicle sat outside in the rain with clogged sunroof drain lines? Check the front floorboard carpets for wetness. If one or both are indeed wet, your sunroof drain lines may be clogged which then sends the rainwater down the A-pillars, inside the cabin, and into the front floorboards, getting the ECM wet in the process (it is up underneath the dash). The ECM then panics and starts throwing spurious OBDII codes and turning on various dashboard warning icons. My wife's 2015 RX350 did this several months ago. The fix was to clear the two front sunroof drains and run our industrial-strength canine hair dryer pointing to the carpets and up under the dashboard for several hours. Once the interior dried out, the dashboard warning icons (including ABS, BRAKE MALFUNCTION,TRAC OFF, and CHECK ENGINE) and OBDII codes (including C1404, C1416, B1479, and P0607) all magically disappeared.

Some folks clear their sunroof drain lines with compressed air. Some folks snake a segment of sturdy weedwacker line or twisted-pair wire cable into them as far as they can reach.

Squidgnat

Thanks RX in NC, I'll certainly check. Don't think there's wetness on the floorboards but we've had torrential rains recently here in GA so its possible. Either way I'll clear the sunroof drains as you suggest. I just thought is was weird for both the codes to show at the same time.

BTW I did read your earlier post regarding your rear wheel speed sensor and subsequent replacement of the bearing. I have FWD as well, so hoping I don't have to do that LOL.