Depending on the model you have, which you didn't post you may have two MAF's. Its possible both could fail at once, but labor to change them should be almost zip. They take like 10 minutes to change. I can see $800, maybe but thats high.

Its pretty commen knowledge that an over oiled K&N can blow MAF's. Your post is one of many.

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2006 CL500
1969 280SE
2023 Ram 1500
2026 Genesis GV70
2007 Tiara 3200