One problem related to check engine light on has been reported for the 2001 Buick Lesabre. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Buick Lesabre based on all problems reported for the 2001 Lesabre.
The vehicle was using more oil than usual. The change engine oil light had come on 300 miles short of the 3k miles to travel, when the consumer tested the oil, it was 1qt low. At the end of the computer test, the mileage was 14650k miles. When the oil was checked at 829 additional miles from the last visit, it was 1/4qt low. The consumer talked to many other Buick owners and did not found another (same make/model) with the same problem.