Air-fuel ratio sensor diagnosis method, device, equipment and storage medium

The invention belongs to the technical field of vehicle detection, and discloses an air-fuel ratio sensor diagnosis method, device and equipment and a storage medium. The method comprises the steps of determining a current diagnosis type according to an air-fuel ratio change accumulation parameter of the vehicle when the vehicle is in fuel cut-off; if the air-fuel ratio change accumulation parameter meets the active diagnosis condition corresponding to the current diagnosis type, the vehicle is controlled to execute intrusive enrichment, and an air-fuel ratio delay parameter is determined; calculating a current diagnosis parameter according to the air-fuel ratio delay parameter and the historical diagnosis parameter; and if the total number of intrusive enrichment times is larger than the preset number of times, whether the response delay fault exists in the air-fuel ratio sensor of the vehicle or not is determined according to the current diagnosis parameters. Whether diagnosis is needed or not and the diagn