# Question about car running rough, ECM trouble code 33 for O2 sensor...

Posted by Mikey P (93 SE) on September 09, 2004 at 12:05:34: Hello all, My car started running rough a couple weeks ago. Doing the diagnostic test I came up with a 33 code, which is for the heated oxygen sensor. I crawled under the car and found I had 1 broken and 2 frayed leads to the O2 sensor. Thinking I had found the problem I replaced the sensor but the issue persisted. I disconnected the battery off overnight after I replaced the sensor. Checking the codes again after, I still have a 33. I have power and ground to the harness connector. The service manual also mentions that this code could be a fuel problem or an air leak. I was wondering if anyone else had had this same code and found anything other than the O2 sensor as the culprit. The car is driveable, and gets about the same mileage, but just runs less smooth. A definite loss of power. Any thoughts? thanks in advance -MP Replys: try putting the car in diag mode II.. --> Matt (93SE) 12:11:28 9/09/2004 (2) I'll give that a try. Thanks Matt. n/m Mikey P (93 SE) 13:38:07 9/09/2004 (1) It would seem as though I have an open circuit.... Mikey P (93 SE) 15:28:01 9/09/2004 (0)

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: Hello all, : My car started running rough a couple weeks ago. Doing the diagnostic test I came up with a 33 code, which is for the heated oxygen sensor. I crawled under the car and found I had 1 broken and 2 frayed leads to the O2 sensor. Thinking I had found the problem I replaced the sensor but the issue persisted. I disconnected the battery off overnight after I replaced the sensor. : Checking the codes again after, I still have a 33. I have power and ground to the harness connector. The service manual also mentions that this code could be a fuel problem or an air leak. I was wondering if anyone else had had this same code and found anything other than the O2 sensor as the culprit. The car is driveable, and gets about the same mileage, but just runs less smooth. A definite loss of power. Any thoughts? : thanks in advance : -MP