The ¡°Check Engine Light¡± started coming up on my 1994 850 Turbo since June this year. I brought my car to a local dealer and came up with a code ¡°4-3-3¡±. I had replaced a Knock sensor by their suggestion. But 10 days later, the light came up again. I went back to dealer again, they told me it was a result of bad fuels. I kept using Sunoco 94 afterwards, but it didn¡¯t change anything. I don¡¯t think the problem is about the knock sensor somehow. I think technicians don¡¯t know how to resolve this problem either.

I was tried to clean this faulty code by myself, but the light still comes up again and again. The car is running good I guess, nothing strange has been found out. I really want to know what to do. Could someone help me here? Thanks ahead.

Jack