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To: DMaA who wrote (156553)	2/3/2006 1:28:28 PM
From: Thomas A Watson	Read Replies (1) \| Respond to of 793743

The process calibration is now built in to the digital controls. The stability of the calibration is orders or magnitude better than any age drift of components. Based upon my own use of digital electronics, I would proffer the life expectancy is decades.

To: DMaA who wrote (156553)	2/3/2006 5:09:11 PM
From: D. Long	Read Replies (2) \| Respond to of 793743

After 10 years, I suspect these systems, fed by drifting and degrading sensors, are doing more harm than good My old 89 Chevy Berretta was a bastard with its sensors. Caused me no end of headaches. Pretty expensive to replace as well. Kristel's Taurus had a problem in her sensor cluster that kept making the check engine light come on (and making it damn hard to get it to pass emissions/inspection). Mechanics kept replacing the sensors, to no effect and great cost. Finally, the problem was fixed - a tiny $5 hose leading into the cluster was ruptured. No one caught it because it was tucked way up inside. Derek