Sequoia climate control issue

That sounds like a similar issue I had with my old BMW 5 series a few years back. Same symptoms: erratic temperature reading, error codes, and AC refusing to engage. In my case, the thermistor was the culprit. Have you checked the cable and plug connection of the interior temperature sensor? A loose or corroded connection can cause havoc with the sensor readings, triggering the whole cascade of problems.

Thanks for the info. When you say thermistor, are you referring to the temperature sensor itself, or is it something else entirely? And where exactly is this interior temperature sensor usually located in the BMW? Maybe it’s in a similar location on my Sequoia.

Yes, I was referring to the temperature sensor itself. I am not familiar with the specifics of a Toyota Sequoia, but in my BMW it was located near the climate control unit in the dashboard. Given the symptoms and the error codes, it seems like the cable or plug being defective is a probable cause. Considering the relatively low mileage for the build year, it might be worth just going to the workshop for a quick diagnostic.

Appreciate the advice. I took it to a trusted local shop, and, just as you suspected, the interior temperature sensor was the issue – specifically a bad connection, like you said. They sorted it out for 95€. Thanks again!