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Old 01-03-2019, 10:56 PM   #29
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Confirmed the Bank 1 Downstream O2 sensor is failing using my friend's Snap-On Computer. When the car is running while you see correct voltages from it you can see under the ready states it keeps flickering back and forth between "OK" and "Not Ready". Ordered a new one from GM Parts direct. Thanks for the help all.
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Old 01-04-2019, 08:36 AM   #30
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Post an update after you install it
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Old 01-10-2019, 07:54 AM   #31
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Quote:
Originally Posted by Rogue Leader View Post
Confirmed the Bank 1 Downstream O2 sensor is failing using my friend's Snap-On Computer. When the car is running while you see correct voltages from it you can see under the ready states it keeps flickering back and forth between "OK" and "Not Ready". Ordered a new one from GM Parts direct. Thanks for the help all.
With the mileage you have on the car I would suggest 4 new sensors
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Old 01-11-2019, 01:56 PM   #32
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With the mileage you have on the car I would suggest 4 new sensors
73k miles? In 20+ years of owning cars I've never even had an O2 sensor failure that early. Heck my 2500HD 6.0 has 180k on it with the original O2 sensors. I can also trace this failure almost directly back to my catalytic converter failure, caused by my valvespring issue.

My problem right now is its 6 degrees outside, so the car may need to hang out a few weeks or more. Not a big deal its in the garage and I have a daily.
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Old 01-11-2019, 09:22 PM   #33
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Amazon has OEM sensors both up and down for 40$ a piece, I just did mine and the voltage between sides is perfect.


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Old 01-12-2019, 12:44 PM   #34
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Amazon has OEM sensors both up and down for 40$ a piece, I just did mine and the voltage between sides is perfect.


DB
Good price, I paid $48 on GM parts direct. I do order parts for my VW on Amazon often.
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Old 01-28-2019, 01:52 PM   #35
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I had the same problem around Christmas time, my car wouldn't pass and I had 4 parameters that were not ready, no codes. I reset the battery about a month before to install an engine component. The car ran fine up to the state inspection time. The inspections asks if I disconnected the battery recently. I said yes, about 3 weeks before. I haven't driven much since then. he advised to take it out and drive it some more. which I did. 300 miles. Still no change. So I took it back and 1 parameter was ready out of the 4 that were "not ready"
I took it to chevy, they said it would take a few more driving cycles before the parameters would set to ready. so I drove some more. Down to 2 after 60 miles.
The advisor said that I may have to drive it under 45-50 mph and drive it another 60 miles. OK, did that. all but one reset. My catalyst was still stating on the scanner, it wasn't ready. I just needed 3 out of the 4 to pass. so I took it back to the inspection station. Turned the car off. it connected the scanner. all 4 back to not ready. WTF???
I drove another 30 miles and came back. didn't turn it off, by that time someone else was in the bay getting inspected. I checked my scanner, 3 out of the 4 parameters were ready. So I left the car running. After 7 minutes, it was my turn. The inspector came out, plugged in his scanner and checked. All parameters ready.....AAW MAN!! it's about time!! Then reinspected the car and it passed!! What a pain!!
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Old 03-21-2019, 10:50 AM   #36
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As an update for anyone still following. I replaced the drivers side rear O2 sensor based on the readings we were getting and the flickering ready state on the snap on computer. That instantly on first startup fixed the issue and the car passed inspection. Thanks all for your input.
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Old 03-28-2019, 12:06 PM   #37
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I recently had to drive nearly 500 miles for all diagnostics to clear. This wasn’t on my Camaro but a GM truck after emission repairs. The point being, these drive cycles are MUCH longer than they used to be - and how long the internet says they are supposed to be. How that happens on a 19 year old vehicle with the original ECM, I don’t know. But it does. It has to be the diagnostic equipment now. No other explanation.
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