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mikefocke · 10-15-2010, 03:39 PM

that the O2 sensors are giving different readings and that would explain how one side gives the readings before the other.

I know one side of my car at about 55K miles had a tired O2 sensor I detected via my code reader. I changed that one and had no codes, not even pending codes, on the other side. Eventually changed the other side a year later even though it never showed a problem via a CEL or pending codes.

My suggestion is to frequently monitor your codes via the OBDII port and a code reader just in case this is the same with your car.

10-15-2010, 03:39 PM	#6
mikefocke Registered User Join Date: Aug 2005 Location: Sanford NC Posts: 2,583	Which may tell you that the O2 sensors are giving different readings and that would explain how one side gives the readings before the other. I know one side of my car at about 55K miles had a tired O2 sensor I detected via my code reader. I changed that one and had no codes, not even pending codes, on the other side. Eventually changed the other side a year later even though it never showed a problem via a CEL or pending codes. My suggestion is to frequently monitor your codes via the OBDII port and a code reader just in case this is the same with your car.