sfo_pete

Long story short...Monday I received a new to me 4K mile 2016 GTS from an out of state P dealer. Threw a minor evaporative leak code P0456 before I could complete my smog test. Assuming I or the local dealer figures it out (new gas cap etc....) and we reset the computer, how many miles will I need to put on the car before the smog test? Local smog guy said 100.

Thanks,

Peter

forbiddenbeat

I think readiness codes take about that much driving. I believe there are shortcuts to getting readiness back more quickly, but they are rather annoying (e.g. drive 40-60 MPH and maintain steady speed for 15-20 minutes) and it's easier just to drive around. Make sure to mix up some in-town and freeway driving, although there's no guarantee they'll get reset within a specific mileage.

barncobob

i try not to buy out of state cars for this very reason..

sfo_pete

Thanks.

sfo_pete

Not helpful.

yoda888

I got 900+ miles and still can get the last sensor to readiness state, 02. Evap and 02 were the last and I got evap into "ok" but can't get 02. This is a complete pain in the ****!

David Borden

You need to find out what the drive cycle is for your particular car. (search "Porsche Drive Cycle") The ECU is looking for very specific driving conditions which will include MPH range and time for each of the readiness monitors. The most important thing is to drive with very smooth throttle application and try to hold speeds steady. Normally they are looking for most of the speeds to be less than 55-60 mph. Its important to drive on mostly flat roads as hills can be problematic. Here is an example: https://www.smogtips.com/smog-questi...an-Drive-Cycle

You can give an inexpensive ODB tester that will tell you what monitors have passed and what is left to pass. This way you can check daily or more often to see if you are ready to go. BTW, it is possible the code will clear itself as well. Certain ones do not require you to clear everything. My guess is only someone familiar with how your Porsche ECU deals with smog related codes.

ipse dixit

This +1

And to the OP, if you embark on trying to artificially reset your ECU this way, be prepared to burn at least an entire afternoon trying, maybe even two if you're lucky.

pfan

Just be aware that the Porsche drive cycle can likely only be accomplished at 3:00 am in the middle of Wyoming. Here in S. Calif. I gave up after 5 minutes, and simply gave it a good workout over about 150 miles. The frustrating part is that you never really know which areas of the cycle have or have not been accomplished. I guess I just got lucky.

Cuda911

I found an area down in chula Vista where there are long wide new roads with no traffic. I go there when I need to do reset drive cycles.

Cuda911

+1 !

Wstsdphisg

I went through this exact scenario, except I stupidly trusted my dealer and failed the first time. Check this thread. I did 200Miles and 12-15 cold start cycles and it cleared. I doublechecked it at the dealer before I smogged the second time.

https://rennlist.com/forums/991/1234...alifornia.html

Best,

Jake

forbiddenbeat

Oh wait, just re-read your post. You shouldn't be resetting readiness when you clear a fault code – as mentioned above any OBD II reader should be able to clear faults without resetting readiness. Readiness only gets reset usually when you disconnect the battery.

sfo_pete

Thanks all, much appreciated,,stay tuned...

David Borden

I do not believe that is correct, but it may be specific to certain ECUs. If you clear codes related to the engine ECU, I am fairly certain it will reset all the monitors... at least that has been the case on virtually every car I have dealt with.