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Q:

mileage sudden drop on 1999 Mercury Mountaineer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
check engine light on and code indicates lean burn. Sudden drop in mileage per gallon from 15 to 10. what could the problem be. The mechanics here are baffled.
(1) Answer
Can you post the codes that are being stored in the engine control module?