We discovered that my wife’s car was “chipped” (reflashed actual) by the previous owner. Never caused any problems for 6 years, until this year when it failed the state (MA) emissions test - not because of dirty emissions mind you, but because the new testing computer software can detect modified ECUs. And the fallback to a tailpipe test is no longer doable - the machines have all been retired.
So… they’ll issue a one-year waiver to get it fixed - but that’s going to involve replacing the ECU - a $1300 part new, if you can find one (apparently that model year was a 1-off, and so far all we can find are used units on eBay). And yes, I checked, it’s not reflashable back to stock.
We’ll probably have to go with a used unit - but… I’m kind of wondering if the dealer is liable for selling a car that had its emissions system tampered? We bought it in 2009, and I believe that 2008 was when dealers were supposed to start doing readiness scans of the ECUs.