I know the 3rd Gen Prius needed the EGR cleaned but haven't seen anything about our 4th Gen. I have a 2017 and 2021 Prius and both have had zero issues but are both getting close to 50,000 miles and I'm wondering if the EGR needs maintenance. FWIW: Transmission job is a breeze in these cars....just drain and fill....I love owning Toyotas!!
There is no need to clean the EGR system on a Gen 4 Prius. The design of the Gen 4 was changed compared to the Gen 3. Do a search on this Gen 4 forum and you will find only a few threads about cleaning the EGR system.
@jerrymildred, working at Tampa Hybrids, reported a 4th gen Prius owner insisted (against their advice) to get an EGR system cleaning. He reported the car had over 300k miles, and carbon build up was minor. I recall a press release for gen 4 (somewhere...), Toyota noted the car had a revised EGR system. They also keep pretty quiet, about gen 3 EGR...
Yes, I agree. The more we touch things, more things can go wrong. That's why US NAVY do oil analysis before changing their oil and such. More down time is not good.
