LT1 O2 sensor question
Thread Starter
Staging Lane
Joined: Dec 2013
Posts: 59
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LT1 O2 sensor question Just got my car back running again after a month and after putting in my new trans I'm getting "O2 Sensor Circuit No Activity Detected." I haven't looked at it yet but can someone help me understand the meaning of this code. Is it trying to tell me that the O2 sensor is somewhere along the line not getting power from either a broken power or ground wire or is it something that could be internal within the sensor? Either way it sounds like I should get under the car and take a peek at the O2 harness and sensor. and follow it up. Just trying to get an idea of what exactly I'm working with here.
I bet the either forgot to plug it back in or its not fully connected. There is a possibility it's failing but if all was good prior to the work then I'm sure it's just unplugged.
Thread Starter
Staging Lane
Joined: Dec 2013
Posts: 59
Likes: 0
I got under the car and checked and it appeared to be connected, I unplugged it and plugged it back in just to make sure the connection was firm. Im tempted just to buy a new one and a real extension harness as I soldered my own up. Could that no activity code mean a failure or do you think its more likely that my harness is garbage? I seam to think that if it failed that I would get one of those high/low circuit codes but im not sure. My pass side o2 was giving me trouble when I first got the motor back in the car, kept blowing my engine sensor fuse, ended up being the sensor itself. I believe these sensors have as many miles on them as the car 197K and I'm sure it didn't help running as rich as I was in my driveway pre-tune with cam/heads. The pass side was dark black when I took it out. I may have possibly killed my d/s sensor now with a rich condition? The car also idles very poorly. It will take a dip to about 550 rpm and start to stumble then pick itself up to around 950 and within 5-10 seconds take another dip down. It will do this until you drive the car, it throws the o2 code and it reverts back to open loop.
If you suspect your home-made extension, put a multimeter on it and check continuity. Or just buy one, they're relatively cheap. For O2's, get Denso. If you buy AC Delco, it's just going to be a Denso sensor in their bag, and cost you more.
I got under the car and checked and it appeared to be connected, I unplugged it and plugged it back in just to make sure the connection was firm. Im tempted just to buy a new one and a real extension harness as I soldered my own up. Could that no activity code mean a failure or do you think its more likely that my harness is garbage? I seam to think that if it failed that I would get one of those high/low circuit codes but im not sure. My pass side o2 was giving me trouble when I first got the motor back in the car, kept blowing my engine sensor fuse, ended up being the sensor itself. I believe these sensors have as many miles on them as the car 197K and I'm sure it didn't help running as rich as I was in my driveway pre-tune with cam/heads. The pass side was dark black when I took it out. I may have possibly killed my d/s sensor now with a rich condition? The car also idles very poorly. It will take a dip to about 550 rpm and start to stumble then pick itself up to around 950 and within 5-10 seconds take another dip down. It will do this until you drive the car, it throws the o2 code and it reverts back to open loop.
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