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Thank you all for replying and your help! In the end, I took my car to the dealership today. It was the EGR, which they replaced as well as well...
I just go to the dealership and have them to a check up every 6 months. This is the first time that’s happened.
I have had my prius for about 9 years (it recently reached 90,000 miles) and have never had this problem and was wondering if someone also has...