2020 Audi Q5 ~ Egr Valve Stuck - After Car Wash? +cooler For A4 8k B8 A6 4g C7 A5 8t 8r 2 0 Tdi
If it gets stuck open, it lets too much exhaust in at the wrong times, causing rough running, smoke, and power loss The hissing could be exhaust gases escaping past a faulty seal When diagnosing issue