2001 Chevy Cavalier 2.2

2001 Chevy CavilierI just replaced my upstream 02 sensor and have not replaced the downstream 02 sensor just yet to see if I only needed one and I replaced upstream and ran diagnostic and the upstream that I just replaced is erroring out. Any advice?


Check your wiring harness and the connections. Provide the engine trouble code you are dealing with for more information.