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Gen 2 heated 02 incomplete

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Gen 2 heated 02 incomplete
Old April 4th, 2020, 10:16 PM   #1
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Gen 2 heated 02 incomplete

Hey guys,

Looking for some advice. I purchased a 2002 gts years ago. I have to smog for my state emissions test. The heated o2 sensor reads incomplete. The rear oxygen sensors were replaced with dummy sensors by a previous owner. So no issues with check engine lights etc. today I replaced the rear dummies for correct o2 sensors. I guess my question is, why would someone replace the rear sensors with fakes? Iím hoping after I drive it tomorrow Iíll be ok but Iím almost certain that wonít be the case. Please advise if at all possible. Thank you all very much.


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Old April 4th, 2020, 11:35 PM   #2
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If the cats were removed fake sensors would be used to fool the computer into not throwing a code. Does your Viper have cats?
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Old April 4th, 2020, 11:47 PM   #3
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Yes it does. idk if the previous owner had removed them at some point etc.


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Old April 5th, 2020, 07:42 AM   #4
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Probably has a tune?

If you have the sct supplied with the car, set the tune back to stock drive a few times it will pass.
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Old April 5th, 2020, 10:24 AM   #5
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I donít have a tuner with it. If it was tuned, how can I set to stock now?


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Old April 5th, 2020, 11:06 AM   #6
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Could it also be bad O2 sensors?
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Old April 5th, 2020, 02:06 PM   #7
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I believe only the fronts are heated, not the rears. A lot of folks have had problems with non-OEM front O2s. Do not toss your rear sims, you can't get them anymore.

If your car has sat for a while, or only gets used for short trips, then your PCM may need a couple of 20-30 minute drives at steady cruise rpm with the A/C on to update the fuel trims.
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Old April 5th, 2020, 09:32 PM   #8
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Quote:
Originally Posted by rallo87 View Post
I guess my question is, why would someone replace the rear sensors with fakes?
Quote:
Originally Posted by Chuck 98 RT10 View Post
If the cats were removed fake sensors would be used to fool the computer into not throwing a code. Does your Viper have cats?
Quote:
Originally Posted by rallo87 View Post
Yes it does.
I would verify that the previous owner didn't gut the cats. Do they get very hot in use?
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Old April 5th, 2020, 09:53 PM   #9
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They get Very hot. Iím trying to complete a drive cycle. If that monitor remains incomplete I will remove the exhaust and confirm


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Old April 6th, 2020, 07:28 AM   #10
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If you have or can borrow a temp gun, it would tell you if both cats are heating up in unison. You could have plugging issues on one side that is leading to O2 problems. Cats normally operate in the 600F range and vary according to whether they are oxidizing or reducing the exhaust flow.
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Old April 6th, 2020, 12:21 PM   #11
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All emissions tests passed this morning. Thank you all for your helpful info. Thankfully the downstream o2 sensors fixed it. I really appreciate all of you and this forum


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