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      04-15-2021, 03:22 AM   #2
thejeremyman9
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Drives: 2015 BMW 335i
Join Date: May 2019
Location: Cali

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Path of least resistance is probably just swap your OEM DP back on and flash back to stock and relock to DME. CA now checks for tunes with the smog check, so your car MUST be on 100% OEM DME software or you will immediately fail and get state ref, regardless of emission monitors. The other mods shouldnt be a problem unless the place doing the smog is really strict. So you don't need to go back to stock... just OEM DP and stock tune. Minor labor for the DP really.

Ive been doing "under the table" sniffer tests on my other cars for 10+ years, but AFAIK you can't do that with the OB2, since it must be connected to the vehicle, so they cant "trick it" like a sniffer where they just put it in a different car's exhaust.

The O2 simulators and spacers have mixed results. A spacer with a mini cat MAY get you emissions ready if you go back to stock tune and drive gently through the drive cycle, but as you said, the smell and visual would be an obvious fail. Some shops may overlook that as long as you pass the OBD2, potentially for a "extra fee".
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