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Secondary O2 Sensor CEL

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Old 04-24-2015, 03:38 PM
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Secondary O2 Sensor CEL
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Old 04-24-2015, 05:48 PM
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The high voltage code is usually an open circuit (could have just been unplugged). It is plugged in now, right?

Some of the monitors can take a while to set. They are reset everytime you clear codes also.
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Old 04-24-2015, 06:17 PM
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Old 04-24-2015, 06:23 PM
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Unless you have a way to monitor rear o2 voltage it's just going to be a guess if it's wiring or a bad sensor.

It would be best if you put the stock intake on also.
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Old 04-24-2015, 06:25 PM
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Old 04-24-2015, 06:36 PM
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Originally Posted by LTBALTBMX
I did the propane bench test on the sensor, and it didn't rise much beyound .1 volts. Hopefully replacing the sensor will make quick work of this.

You wouldn't happen to know where the sensor feeds into, would you? I had a look at the connector today and the rear of the plug looked like it was exposed from the conduit. Its not necessarily broken, but it'd be nice to confirm.

Really appreciate having somebody else to bounce ideas off of, by the way. Thanks.
Full rich on a narrowband should be close to 1000mv, so the sensor could definitely be your issue.

The back of the connector being exposed isn't an issue. There are seals on each wire in the connector.
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Old 04-25-2015, 02:10 AM
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Old 04-25-2015, 02:38 AM
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Originally Posted by LTBALTBMX
I changed out the rear O2S, now I am down to 2 not readys (catalyst and evap) and no DTCs. Hopefully a few more drives will do the trick.

Is there any way to know what is going on with these monitors, like how close they are to complete?
Not that I'm aware of. The service manual might list the requirements for them to set though. I've never paid attention to them since I don't have to do emissions checks where I live.
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Old 04-25-2015, 03:10 AM
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Old 04-26-2015, 09:01 AM
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Old 04-26-2015, 11:34 AM
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Originally Posted by LTBALTBMX
Where do you live? Happy land?

Not quite. No emissions, but there is still salt and cold in abundance during the winter.


Originally Posted by LTBALTBMX
YES! Catalyst is now ready too. Come on EVAP.... hurry up

Good to hear. I'm curious if you cleared the DTCs after replacing the O2 or if they cleared themselves.
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Old 04-26-2015, 12:10 PM
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Old 04-26-2015, 06:04 PM
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Good luck getting the evap to ready. The evap monitors rarely set on these cars. Most emissions standards actually allow for 1 monitor to not ready though, but that's here in the states. I'm not at all familiar with Canadian emissions.
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Old 04-26-2015, 07:54 PM
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Secondary O2 Sensor CEL
Do you have a part number for the secondary oxygen sensor? mine is throwing low/hi voltage codes and I have my emissions coming up in June
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Old 04-26-2015, 11:38 PM
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Originally Posted by ECaulk
Do you have a part number for the secondary oxygen sensor? mine is throwing low/hi voltage codes and I have my emissions coming up in June
It should be 12616506 I believe.
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Old 04-27-2015, 09:05 AM
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Old 04-27-2015, 10:22 AM
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Originally Posted by 09CobaltSS1
It should be 12616506 I believe.
Thank you, just wanted to verify amazon
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Old 04-27-2015, 05:30 PM
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Old 04-27-2015, 06:18 PM
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My evap is never ready, even after I changed the entire system still not ready. Doesn't do nothing to car so I don't care
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Old 04-27-2015, 08:08 PM
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Old 04-27-2015, 08:36 PM
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Like I said earlier. Good luck getting that monitor to ready. I have not seen one LNF with an evap system monitor readied. Even bone stock cars on a stock tune.
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Old 04-27-2015, 08:51 PM
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Now I want to go check mine
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Old 04-27-2015, 08:56 PM
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Do it!! haha
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Old 04-28-2015, 12:29 AM
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Old 04-28-2015, 09:19 AM
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My EVAP wasnt ready. But I also flashed an updated tune Saturday and have only driven about 75miles since.
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