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Old 05-24-2014, 07:57 AM   #1
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Join Date: Apr 2006
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Default OBDII Reporting N/A

When the shop hooked up my 2005 Mustang to get inspected, they said that although the car appeared "ready" many if, not all, of the codes were reading N/A and it wasn't communicating with their computer. They also verified the N/A status via a separate handheld scanner. I have a screenshot of the scanner, but cannot posted it here.

The vehicle is running great, no issues. It does have a Diablosport tune and it has had it for years, no changes there and never had an issue. The only other recent change was that I had the stepper motors replaced in the instrument cluster.
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Old 05-24-2014, 10:54 AM   #2
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Location: illinois
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I have a BAMA tuner on mine, but put it back to stock before i had my emissions done and passed. I would start with removing that Diablo tuner then having it rechecked. I don't know what Diablos setup does, but i know any tuner can affect 02 readings and catalyst readings, however you did say you've never had a problem before. Have you recently had any check engine lights cleared or anything fixed for a CEL and had it reset? You should take it to a shop that has the capability of reading your 02 and catalyst monitors and see if they are reading, this is most likely your problem.

Last edited by XGC JACOBS; 05-24-2014 at 11:06 AM.
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Old 05-24-2014, 11:15 AM   #3
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You need to contact Diablosport and ask them if their tune turns any of the sensors off. My Brenspeed 93OCT Track tune turns my rear O2 sensors off and I have to put it back to stock and run it till they are in the ready state to pass inspection.
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Old 05-24-2014, 06:03 PM   #4
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I tried disconnecting the battery for a couple of hours, no change they were still reading N/A. I then restored my factory settings from my Diablosport. Now I see that some are "Not Ready", which I think is an improvement over N/A. I will get it through a drive cycle and then hopefully that will solve the issue. Then I will decide if I want to put the tune back in, probably will.
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