Seems like the AMM is a regular maintenance item, but one that causes people a lot of puzzling sometimes before they finally just change it out. So I am wondering if people could respond with how long their AMM lasted before it died, in miles and years. I am also curious if the life span is more closely related to years or miles. Here is the data I have so far:

1998 C230 101,000 miles, 6 years
1998 C230 61,000 miles, 3 years
1997 C230 83,000 miles, 5 years

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra