Hilux Transmission Oil Temperature Sensor Error

I had similar transmission issues in my Hilux. Are the symptoms more frequent when the engine temperature rises after several minutes of driving?

Good call, I didn't mention it. The symptoms are pretty much constant, hot or cold, but maybe a little bit worse after 20 minutes driving. How did you resolve it, and how much did it cost?

In my case, the garage identified the oil level as being too low, causing overheating problems due to insufficient lubrication. I had the same symptoms: slipping gears and the engine warning light. I'd suggest going to a workshop; they'll know how to proceed.

Thanks! You were spot on. The gearbox oil was indeed low. They topped it up and replaced the faulty sensor. The final bill was 365€, but now it runs like a dream. Cheers for the help!