2002 A8 4.2l failed obd2 read

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Topic: 2002 A8 4.2l failed obd2 read (Read 6463 times)

_nameless

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	2002 A8 4.2l failed obd2 read « on: May 23, 2014, 06:39:51 PM »

Well I just tried to read a a8 for a base and well... didnt work out too good. it communicates no problem but soon as it goes to read it fails... I tried mpps first it prompted me to cycle key then failed, for giggles i tried nefmoto with no luck? Anyone else run into anything similar? Unfortunately I wont have the car till monday now. I dont mind bootmode but i just dont understand why i would have a problem with this?
thanks
marty


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k0mpresd

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	Re: 2002 A8 4.2l failed obd2 read « Reply #1 on: May 23, 2014, 06:50:47 PM »

what protocol in mpps did you use? i only ever use the 1.8t bosch me7.5 for anything me7. some of the others have a tendency to not work.


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ddillenger

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	Re: 2002 A8 4.2l failed obd2 read « Reply #2 on: May 23, 2014, 07:01:27 PM »

Quote from: k0mpresd on May 23, 2014, 06:50:47 PM

what protocol in mpps did you use? i only ever use the 1.8t bosch me7.5 for anything me7. some of the others have a tendency to not work.

What he said. Just not on the CAN ecus. Danger, danger Will Robinson.


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_nameless

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	Re: 2002 A8 4.2l failed obd2 read « Reply #3 on: May 23, 2014, 07:13:56 PM »

Quote from: k0mpresd on May 23, 2014, 06:50:47 PM

what protocol in mpps did you use? i only ever use the 1.8t bosch me7.5 for anything me7. some of the others have a tendency to not work.

cool good to know... naw I used the Audi>A8>4.2l ME7.1.1... tried twice then tried nef with no luck... thanks for the tip tho


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prj

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	Re: 2002 A8 4.2l failed obd2 read « Reply #4 on: May 29, 2014, 04:04:24 PM »

You are lucky the clone didn't read.
Worse is when it reads and on write bricks that ECU.


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edgy

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	Re: 2002 A8 4.2l failed obd2 read « Reply #5 on: May 30, 2014, 10:29:41 PM »

You have to "wake up" the ECU on certain A8s before you can read or write.

I can't remember the process off the top of my head, but, I'll dig it up and post it tomorrow.


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2002 S4 full stg 3
2001 S4 stg 2
2001 TT 225 stg 2
1988 80q 4.2
2005 A4 (the wife's)

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