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u may need to reset ecu to clear problem if cel light on, but if no cel light on ul be fine.
Not quite accurate.
It's worth either resetting the ECU (or disconnecting the battery, same effect) after swapping any of the engine sensors, the MAF especially, whether or not there's a CEL.
If you don't, there's potential for correction values the ECU learned "before" to continue to affect the way the car runs "after". Resetting forces it to re-learn from scratch.
What model year? If, as per your original post, it's a 2000MY car, you didn't so much get discount as pay a surcharge - they're less than a hundred quid retail from Subaru.