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California Emissions


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  • Moderators

When I purchased my car 12 years ago it had an FVD tune on it.

 

No issues with the emissions until this year.  Apparently CA now checks the ECU as my car failed with "modified software".

 

I'm not that bothered with having the tune so I took it to my local Porsche dealer and have them reflash the SW back to stock.

 

However, my car is still failing emissions due to "modified software". 

 

Anyone have some guidance on how I can get my car through emissions?

 

Thanks!

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Back in 2006 Porsche started putting a tamper byte the ECU - I'm pretty sure once that byte has been set it cannot be reset by normal means.

Have you tried FVD to see if other California customers have reported this? and what they did )if anything)?

 

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Porsche, and a lot of states that check, use a simple "check sum" procedure to verify if a computer has altered software; any modifications as simple as changing the ignition timing would alter that summation value, even if those modifications were disabled, failing the car.  Unfortunately, I really don't know how to circumvent this problem.

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Thanks.  I left it with the Porsche dealership to see if they could figure out what's going on.   You would think a stock reflash would have been sufficient, but you can never underestimate the stupidity of CARB. 
Maybe I'll just go register the car in Montana 😁

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Porblem with aftermarket reflashes is that you never know what the system is writing to the DME; if it wrote something extraneous to the cluster for example, which might not be over written or replaced during a factory reflash, leaving something to trip the checksum values.  Over the years, we have seen many horror stories about this kind of thing which sometimes ended up replacing the DME, which is an extremely expensive proposition.

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