1997 D90 NAS won't pass emissions - Defender Source
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  #1  
Old July 22nd, 2016, 11:56 AM
da3bous
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Haithem
1997/Defender 90 NAS
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1997 D90 NAS won't pass emissions

Tried searching for threads regarding my issue but didn't see resolution to any of them.

1997 D90 NAS won't pass emissions in oregon due to Misfire not supported, Catalytic Not supported and throwing a code of P3999 which i believe is a phantom code.


Does anyone have any ideas? Could it be a low battery? Car came from California and has a title from there so it must have passed at some point since the tags are valid till 12/2016
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  #2  
Old July 22nd, 2016, 01:07 PM
kelvinite
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Do you have the actual fail codes for the 'misfire' and 'cat not supported'?
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  #3  
Old July 22nd, 2016, 01:08 PM
da3bous
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Haithem
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They are not codes, the readiness system just says Misfire Not Supported and Cat not supported
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  #4  
Old July 22nd, 2016, 01:22 PM
kelvinite
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It could be that the test shop's system may have an issue with your Defender. Maybe you can try a different shop?
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  #5  
Old July 22nd, 2016, 01:29 PM
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I would suggest getting/borrowing a ODB scanner to pull the actual code.
I think places like Autozone may even do it for free, like they do batt testing for free.

]Sound like it could be bad O2 sensor or bad cat, rr misfire or... it's anyone's guess.
You should read the code, reset/clear CEL with a OBD scanner, drive around... and if CEL comes back, scan again to see if it's same code then troubleshoot from there.
Just b/c it was tested before in CA, means nothing. FWIW, after I bought my truck, I did emission test & registered the truck in CA. All good, until 3 days later, the CEL came on with a cat reading error. I have 18mos to find the problem before needing emission test again.

Good luck!
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  #6  
Old July 22nd, 2016, 01:44 PM
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Quote:
Originally Posted by lithium1330 View Post
I would suggest getting/borrowing a ODB scanner to pull the actual code.
I think places like Autozone may even do it for free, like they do batt testing for free.

]Sound like
You should read the code, reset/clear CEL with a OBD scanner, drive around... and if CEL comes back, scan again to see if it's same code then troubleshoot from there.

Good luck!
This is exactly what I do every year for the same codes - I clear the codes via OBD and drive around for a couple days. If it doesn't come back on, I go to the emissions inspector. Works like a charm. Granted, I'm going to be replacing my engine in 18-24 months, so this is totally fine for me.
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  #7  
Old July 22nd, 2016, 03:00 PM
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Quote:
Originally Posted by smob View Post
This is exactly what I do every year for the same codes - I clear the codes via OBD and drive around for a couple days. If it doesn't come back on, I go to the emissions inspector. Works like a charm. Granted, I'm going to be replacing my engine in 18-24 months, so this is totally fine for me.
Ha! Sound familiar. I did that with my NAS for years. I moved my registration to Wintergreen VA where they don't have emissions, which is a beautiful thing.

------ Follow up post added July 22nd, 2016 04:00 PM ------

Quote:
Originally Posted by smob View Post
This is exactly what I do every year for the same codes - I clear the codes via OBD and drive around for a couple days. If it doesn't come back on, I go to the emissions inspector. Works like a charm. Granted, I'm going to be replacing my engine in 18-24 months, so this is totally fine for me.
Ha! Sounds familiar. I did that with my NAS for years. I moved my registration to Wintergreen VA where they don't have emissions, which is a beautiful thing.
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  #8  
Old July 22nd, 2016, 03:02 PM
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Steve
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Quote:
Originally Posted by 1of40 View Post
Ha! Sound familiar. I did that with my NAS for years. I moved my registration to Wintergreen VA where they don't have emissions, which is a beautiful thing.
Actually, I may have learned this from you, come to think of it.
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"Land Rover = rolling mechanical failure. it is failing even as it sits in the driveway. get used to it. My 90 just had a failure as I was typing this."
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  #9  
Old July 23rd, 2016, 10:36 AM
da3bous
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Haithem
1997/Defender 90 NAS
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Yeah its not a code, i think its just their computer system can't read the car properly. I've found a loop hole for the time being by transferring plates from another car on to it. In the mean time i still plan on fixing it/
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  #10  
Old July 24th, 2016, 05:21 PM
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I found that if you disconnect the abs computer it will then communicate
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no thanks whatever I tell you, you will low ball me
I would rather keep the parts in storage
good luck with your search
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