OBDII Scan for emissions testing

[HMM]

First off I did a lot of searching (11 pages to be exact) but didn't find my answer.

I'm hoping someone can help me here.

In Hamilton county Tennessee they do emissions testing yearly (mainly to get the $10 off folks). Anything 95 and above that has the OBDII port they just plug into it and then look underneath to make sure you have a cat - no sniff test. Older cars get the mirror treatment and sniff test.

I'm not sure how they do diesels, hoping it's just a port scan too, but I'm wondering if that's all it is - would a tuned truck pass? Has anyone gone through and passed without resetting back to stock? I'm not sure what all gets scanned but I was wondering if the Spartan or the other tuners will show everything being "A okay" as far as the scan tool is concerned.

Or is it a port test and sniff test for diesels???

[greasltn]

Maybe someone in TN will chime it, but in NC they don't even plug in the diesels. If you have a GVRW over 8500 (I think that's the magic number) it's just visual.

[HMM]

Thanks for the info. Hopefully someone from my area will chime in. I'm also going to stop the next guy I see out and ask him.

[greasltn]

You could go to a local shop that does inspections and ask a tech.

[Big Angry Hillbilly]

Doesn't matter... I believe all they are looking for is a P1000 DTC, or any other codes.

They may check readiness monitors, but if you read the sticker on the valve cover, I believe it says something to the effect of "May not meet all OBDII requirements". So basing an emissions test off of OBDII information obtained from the vehicle may be a moot point.

[forddieseldoctor]

Hmm in Sheboygan county Wisconsin all they do is the OBDII vehicles, but they don't do anything over 8500 lbs GVW. So I don't have to worry about my truck.

[HMM]

Thanks for the info guys. I was hoping to run into someone local by now but I've been down with a stomach bug - so bad I'm on day two in the hospital...

[forddieseldoctor]

That sucks... Hope you get better.

[jimd1050]

I just went through it in February and had to put the stock exhaust etc. back on to get my Mass Inspection Sticker. My dealer ran it through the state scanner before I tried it for real and it failed - we got a "Catalyst Not Ready" error and an "EGR Not Ready" error which translates to "FAIL" in Massachusetts. Hope that helps...