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I have a obs 7.3 manufacturing date of 10/96 which ICP part number do I use to make sure I order the right one it had an after market one already so I can’t use that as reference some websites say F6TZ9F838A and others say The F4TZ9F838A guess my question would be how much of a different will it make if I install the wrong one ?
 

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You would normally go by the engine serial number (stamped in the block down by the oil filter), but you can get the later one,F6TZ9F838A, and be fine. The only difference should be in the connector pin material. The break point is engine S/N 375548 and prior for the early one and engine S/N 375549 and after for the later. Cheers!
 
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