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I had a MIL pop up on my 05 Civic Hybrid yesterday, and when I read the code today it came up as P2000 "NOx adsorptive catalyst efficiency below threshold

Digging around online, I found two Honda service bulletins that seem like they could apply:

• https://www.autocodes.com/uploads/honda/07-036.pdf
• https://static.nhtsa.gov/odi/tsbs/20...42649-3282.pdf

Both seem to say that it's an errant code, and that it just needs the PGM-FI to be updated, but they give different locations to punch the VIN to indicate the update has been completed. They also give different Program ID and Program P/N. So my questions are:

• What's the difference between these service bulletins?
• Does the 2011 bulletin supersede the 2007 bulletin (meaning I can just do the update mentioned in the 2011 bulletin)?
• What exactly is PGM-FI software?
• Can I update it myself, or would it have to be at a shop or dealership?

P.S. I did find this older thread about the same issue, but wasn't sure how people on this forum feel about resurrecting decade old threads.

Thanks!

 
Rep Power: 224

• The difference is one is specific to a set of VINs, the other is for all. Other than that, who knows.
• If the 2011 bulletin includes your VIN, probably.
• PGM-FI stands for programmed fuel injection. Referring to the ECU/PCM software.
• Dealership is going to be the only ones with access. Unless you have a generic auto shop with all the Honda specific tools.

 
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Thanks! The VIN wasn't stamped, but the dealership claims the update has already been done. Still trying to figure out where it was done so I can confirm.

If it really is a bad O2 sensor, how do I tell which one? My understanding (someone please correct me if I'm wrong) is that if the code is for catalyst efficiency then it would be a post-cat sensor. But which one would be bank 1 on this car?