Q: TPS failure

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I have had 4 throttle positioning sensors replaced over a 3 year period: the 1st replacement (OEM) lasted - 1 yr and 1 month; the 2nd replacement (not OEM) lasted -1 month; the 3rd replacement (OEM) lasted1 yr and 2 months. What is causing the TPSs to fail so often?

My car has 98000 miles.
My car has an automatic transmission.

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