ccp1979
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Failed Emission Test

Sat Apr 20, 2019 10:23 am

We bought a 2017 Rex in NJ but live in NY so we have to get the emissions tested for NY. Went to 2 different dealers today and neither one could figure it out!!! My husband put it in emissions mode. One guy said it needed to drive until Rex started. He did that. Still didn’t work. Next dealer said it needs to be driven 100 miles. No one seems to know!! Ugg any advice or help would be great!!

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MKH
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Location: Dallas

Re: Failed Emission Test

Sat Apr 20, 2019 10:46 am

When your husband put in in emissions mode, didn't the Rex engine start? That should be all that is needed.
Mark H.
2015 i3 Rex, Capparis White, Tera World, Technology & Driving Assistant, Parking Assistant, Harman Kardon Audio System, 19 inch 427 wheels, EVoInnovate EVSE

ccp1979
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Joined: Sat Apr 20, 2019 10:18 am

Re: Failed Emission Test

Sat Apr 20, 2019 11:02 am

It did. And he just got home and told me there are codes that need to be cleared they said? And these can only be clearer by driving 100 miles. And after they clear it should work?

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MKH
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Re: Failed Emission Test

Sat Apr 20, 2019 1:02 pm

Ok, that means something was done to the car, where the 12 volt battery was disconnected. Without power, the car's computer has lost all its accumulation of diagnostic data, and and needs to rebuild this during the car's operation. Do a combo of idle, city, highway, short, long trips over a few days to let the car collect a new data set, then it should be ready to pass inspection. The OBD sensors (much like anything connected to the ECU) require self-calibration to function correctly, which requires driving around to complete that, if it has all been lost because of a battery disconnect.
Mark H.
2015 i3 Rex, Capparis White, Tera World, Technology & Driving Assistant, Parking Assistant, Harman Kardon Audio System, 19 inch 427 wheels, EVoInnovate EVSE

ccp1979
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Re: Failed Emission Test

Sat Apr 20, 2019 1:10 pm

My husband says - “That’s the most useful information I’ve had all day- thank you so much!!” That must be what happened. He’s wondering if you know- does the range extender also need to come on to rebuild the data?

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MKH
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Re: Failed Emission Test

Sat Apr 20, 2019 1:48 pm

That I'm not sure about, but it would not hurt to run the car down to the point that the Rex started, and let it run while driving for a bit. I know that the Rex starts up and runs a short maintenance cycle every 50 days or so automatically, if it hasn't been triggered and in use during that time, to keep it in good operating condition, so the car will be collecting running data on it.
Mark H.
2015 i3 Rex, Capparis White, Tera World, Technology & Driving Assistant, Parking Assistant, Harman Kardon Audio System, 19 inch 427 wheels, EVoInnovate EVSE

ccp1979
Posts: 4
Joined: Sat Apr 20, 2019 10:18 am

Re: Failed Emission Test

Sat Apr 20, 2019 1:53 pm

Makes sense. We’ll run it down just in case! Thank you so much for all your help!

bwilson4web
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Location: Huntsville, AL

Re: Failed Emission Test

Sun Apr 21, 2019 1:28 am

One caution about disconnecting the 12V battery. I've not done this, yet, so I'm only sharing what I've read here.

There are reports that changing a 12V battery requires pairing it with the car. My only caution is disconnecting and reconnecting a 12V battery may trigger the battery repairing.

When I owned Prius, doing a 12V, power-on reset, cleared codes which sometimes was necessary. For example, trying to restart a Prius three times when it is out of gas sets a code that prevents further attempts even after adding gas. Doing a 12V power-on reset clears the code and the Prius starts.

For my 2014 BMW i3-REx, I use Bimmercode, an iPhone App, to read and clear codes using an iCab, OBD interface. But I caution that I've not done any 12V battery work ... yet.

Bob Wilson
20k/27k mi 2014 BMW i3-REx
10k/10k mi 2017 Prius Prime

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MKH
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Re: Failed Emission Test

Sun Apr 21, 2019 3:37 am

changing a 12V battery requires pairing it with the car
Yes, replacing a 12V battery in a BMW with a new one requires that it be 'registered' with the car for best battery life and to avoid electrical issues. If you disconnect and reconnect the existing battery, however, it does not need to be re-registered, the existing registration info is recorded/stored/held in a solid-state memory chip, similar to what is in a thumb drive.

During the BMW battery registration process, the following happens:
- Battery capacity is set to 80%
- Current Odometer reading is stored
- Stored battery statistics such as: current, voltage, battery charge level, are deleted.
- Stored temperature statistics are deleted

The BMW battery management software uses this stored data, and data it collects, to set and adjust optimum charging levels for the battery over time.
Mark H.
2015 i3 Rex, Capparis White, Tera World, Technology & Driving Assistant, Parking Assistant, Harman Kardon Audio System, 19 inch 427 wheels, EVoInnovate EVSE

bwilson4web
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Location: Huntsville, AL

Re: Failed Emission Test

Sun Apr 21, 2019 5:46 am

MKH wrote:
Sun Apr 21, 2019 3:37 am
. . . the existing registration info is recorded/stored/held in a solid-state memory chip, similar to what is in a thumb drive. . . .
Is the memory chip part of the battery or something part of the car?

Thanks,
Bob Wilson
20k/27k mi 2014 BMW i3-REx
10k/10k mi 2017 Prius Prime

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