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      01-08-2017, 12:44 PM   #1
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Smog readiness

Thought i'd post this to help others having the same issue.

If you reset your ECU/Clear codes/Change your battery you also end up resetting all of your readiness sensors. If all of your sensors aren't "ready" you can't pass your smog test (in certain states).

Most of the sensors will become ready just from regular driving but 1-2 or two sensors seem to never become ready even after hundreds of miles of driving.

Eventually I figured out that you have to drive the car for ~5 minutes between 40-60mphs @ under 3k RPM.... which to be honest are parameters i'll never meet on a normal basis...

My suggestion if you have a OBD dongle is to download a free app called ODB Car Doctor, this app has a feature that lets you check OBD readiness. Just leave the app open while you're driving so you can see when all the sensors are ready.

Get on the slow lane of the freeway when there is no traffic and set your cruise control to 55mph and make sure you are in a gear that will put you at under 3k rpm.... after about 5 minutes your last two sensors should be come ready.
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      01-08-2017, 01:48 PM   #2
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Quote:
Originally Posted by dreamspeed View Post
Thought i'd post this to help others having the same issue.

If you reset your ECU/Clear codes/Change your battery you also end up resetting all of your readiness sensors. If all of your sensors aren't "ready" you can't pass your smog test (in certain states).

Most of the sensors will become ready just from regular driving but 1-2 or two sensors seem to never become ready even after hundreds of miles of driving.

Eventually I figured out that you have to drive the car for ~5 minutes between 40-60mphs @ under 3k RPM.... which to be honest are parameters i'll never meet on a normal basis...

My suggestion if you have a OBD dongle is to download a free app called ODB Car Doctor, this app has a feature that lets you check OBD readiness. Just leave the app open while you're driving so you can see when all the sensors are ready.

Get on the slow lane of the freeway when there is no traffic and set your cruise control to 55mph and make sure you are in a gear that will put you at under 3k rpm.... after about 5 minutes your last two sensors should be come ready.
There should be a program to generate readiness while your parked as well.

I'm sure dealers don't drive around just to pass inspection.

On vw/audi there'sa program called vcds where you can go through a set of instructions until everything passes but im not sure for bmw
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      01-08-2017, 07:30 PM   #3
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Great post and thanks for sharing! May I ask how and where did you get this information from?

Also with the app can I use the Carly OBdII adapter or do I need something else?
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      01-08-2017, 08:52 PM   #4
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For my ESS supercharger I had to install a specific readiness tune to get the car to pass as the stock tune does not allow those readiness codes to be set.
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      01-10-2017, 01:20 AM   #5
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Quote:
Originally Posted by GRUESOM3 View Post
There should be a program to generate readiness while your parked as well.

I'm sure dealers don't drive around just to pass inspection.

On vw/audi there'sa program called vcds where you can go through a set of instructions until everything passes but im not sure for bmw
I'm sure the dealer has some kind of machine that can force readiness. Although when i took my car in for some warranty work they reset my ecu and i got the car back with 3 sensors that were not ready...

Anyways, i'm mainly speaking of when you reset the ecu on your own to clear a code.
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      01-10-2017, 01:25 AM   #6
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Originally Posted by BeamerBimmer View Post
Great post and thanks for sharing! May I ask how and where did you get this information from?

Also with the app can I use the Carly OBdII adapter or do I need something else?
I took my car to get it smogged and the mechanic said i had a sensor that wasn't ready and to drive it some more. I drove 200 miles took it back and still not ready...drove another 200 miles and took it back and still not ready.

I did some research online and it seems that the O2 sensor usually doesn't become ready with normal driving. Out of all the methods I found, the one i listed above seems to work the best.

I actually ended up resetting my ecu and testing the method 3 separate times and every time it worked perfectly for me.

The Carly dongle should work, the OBD Car Doctor app is free so it doesn't hurt to try. Just DL the app and see if you can connect with the OBD car doctor app. This is for an iPhone, i don't know if that app is available for android. Although i'm sure there are other free apps that have this feature.
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      01-11-2017, 01:56 PM   #7
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To sum things all up...just Google: BMW Drive Cycle and it'll explain everything and how to get each monitor to be in ready state.

I had to do this recently for SMOG, but could not get the o2 sensor to kick on no matter what I did.

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      05-03-2017, 05:47 PM   #8
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question. once readiness is set for all sensors, does it hold those settings until you flash the ecu again, or do you need to do the cycles over again and get smogged right after readiness?
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      05-03-2017, 06:06 PM   #9
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Quote:
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question. once readiness is set for all sensors, does it hold those settings until you flash the ecu again, or do you need to do the cycles over again and get smogged right after readiness?
Will stay ready until a fault appears, until battery is disconnected, or until its flashed.
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      05-03-2017, 07:02 PM   #10
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      05-03-2017, 07:25 PM   #11
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Quote:
Originally Posted by Mike Benvo
Quote:
Originally Posted by Mvy View Post
question. once readiness is set for all sensors, does it hold those settings until you flash the ecu again, or do you need to do the cycles over again and get smogged right after readiness?
Will stay ready until a fault appears, until battery is disconnected, or until its flashed.
Thanks Mike. Do 200 cell high flow cats left in the factory position tend to throw a fault after a while or prevent O2 readiness?
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