RX Running Rich

Oh, that sounds frustrating! I have an RX too, and I had similar symptoms a while back. Did you notice any difference after filling up at a particular gas station, or after a longer trip? It could be something simple, but a rich mixture is never a good sign...

I usually fill up at the same place. No long trips recently. What was the cause when you experienced this?

Well, in my case, it turned out to be a faulty fuel injector. Given your symptoms, and that check engine light, I strongly recommend getting it checked by a qualified mechanic. I know it's a pain, but better safe than sorry!

Thanks for the advice. I'll take it to a workshop to check the fuel injectors. I suspected as much. Cost 515€ to repair.