hello, i have a 95 es300 with about 150k miles. the other week the check engine light came on and i took it to a certified mechanic. he tested and ran the error codes and everything came back ok. he tested the egr valve and it passed all tests. the light stayed off for about a week and it came back on again. has anyone had the same problem with a egr valve? if so, is it ok to keep driving it with the check engine light on? the car is running great without any problems. any suggestions on how i can clean the egr valve?
