One problem related to o2 sensor has been reported for the 2001 Ford Focus. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Ford Focus based on all problems reported for the 2001 Focus.
Purchased car in December 2000 within days brakes squealing and grinding. . Called dealer said to let wear in. . Problem persisted. . Engine light came on . . Took car to nearest d dealership. . In January 2001. . Brakes shoes back and pads on front replaced. Oxygen sensor, and parking brake replaced . . Brakes still had problem engine light still on. . Took to dealership where purchased. . Kept 12 days. . Brakes adjusted and computor and ignition were replaced. . Light off. . Brakes still trouble. . Took back numerous times. . For check-ups. . At 16,000 told brakes need to be replaced in front and tires where all worn away on inside of tire. . Bald!! . . Manufactor and dealer would not pay for. . Replaced all four tires, alignment, and new brakes put on front brakes. . Car still not right with brakes. . Shaking violently of car while braking at any speed. Or going downhill . Took back to dealership rotors were no good as well as front brakes. They replaced. . Inner tires already wearing out. . . Brakes still giving noise and grinding. . Took back within month. . They said fine. . Took back again when oil changed. . Brakes where said to be fine. . Brakes noisy and grinding as usual. . 3 weeks later brakes failed. . Had car towed to dealership. . . . They state needs new brakes on front and backshoes cracked and need new rotors. . . They keep saying its the way we drive car. . . No way. . Never had this much problem with any brakes in any car we have owned. . . Car is very unsafe and made with inferior products. . (tiresize: 15).