car shuts off after starting

[lost_soul]

2004 a6 2.7t 130k this morining pos doesnt stay running... i turn on the car and within 5seconds or it dies completly.. i have voltage and fuel not sure what else i can check or do at this point
thanks in advance

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[cu52]

Any codes? does it rev up toward 2k to stay running then die? Any recent work to it?

[lost_soul]

only have a generic car scanner nothing showing up so i tried it again to see if itll start and if i can rev it up andbbnit started up perfectly fine not really sure why it would not want to start and know after a few hours later it started

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[lost_soul]

Any codes? does it rev up toward 2k to stay running then die? Any recent work to it?

no codes generic scanner only, nothing major since last year only oil change in March. at the moment it happened it would even go up to idle. tried again when i got home work and the bastard started up not really sure why

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[73tiiguy]

Could it have been the immobilizer? Happened to my s6 Avant last week at the gas station. I pumped my gas, got back in and started it up. I put the car in gear and pressed the gas and nothing happened lol. I restart the motor, it dies after a few seconds, then again, and again. Then I noticed the little yellow car and key symbol flashing while it occurs. I opened my drivers door, shut it - locked the car with the key fob, unlocked and since then it's been ok.. But damn these cars have so many frigging electrical gremlins :(

I've also been in the process of changing faulty door lock modules to keep the alarm from going off every 20 seconds.

[lost_soul]

oh wow yeah i hear you one of my key fobs stopped working after i replaced the battery... yeah not really sure but this morning again it dies after starting it if i give it gas while cranking it will high rev and stay runing and i can move the car just havent tried moving it further than the parking spot incase it dies better safe than sorry

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[V1nny]

Immobilizer

[lost_soul]

Immobilizer

dumb question but whats the immobilizer?

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[lost_soul]

also i have been useing my back up fob for like a month if it helps... ill check if i get the key light when i get hom from work

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[V1nny]

dumb question but whats the immobilizer?

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anti theft system, shuts engine down after 3-4 seconds unless transponder in key fob matches code in cluster. All C5 starting 01 have it.

[lost_soul]

anti theft system, shuts engine down after 3-4 seconds unless transponder in key fob matches code in cluster. All C5 starting 01 have it.

oh i see .. and is this like a dealer only reset or is their sone other way

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[73tiiguy]

oh wow yeah i hear you one of my key fobs stopped working after i replaced the battery... yeah not really sure but this morning again it dies after starting it if i give it gas while cranking it will high rev and stay runing and i can move the car just havent tried moving it further than the parking spot incase it dies better safe than sorry

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I believe that the CR2032 battery inside the key fob and the RFID capsule inside the fob have no interaction. Try using other keys to start the motor as the signal from one RFID capsule may be better then the other.

Also I've read on this and other boards that after changing the car's battery - weird things begin to happen.

[lost_soul]

I believe that the CR2032 battery inside the key fob and the RFID capsule inside the fob have no interaction. Try using other keys to start the motor as the signal from one RFID capsule may be better then the other.

Also I've read on this and other boards that after changing the car's battery - weird things begin to happen.

ok so i used my backup fob to unlock the and used my original fob to start and after a 2sec delay the car fired up ..... should i replace both fob batteries and go from or could i have something different

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[m_haiser]

fob batteries will not cause immo issues. one of your keys may have a bad rfid chip however that is unlikely

[V1nny]

I believe that the CR2032 battery inside the key fob and the RFID capsule inside the fob have no interaction. Try using other keys to start the motor as the signal from one RFID capsule may be better then the other.

Also I've read on this and other boards that after changing the car's battery - weird things begin to happen.

correct, they are in different parts of the fob, and have no connection whatsoever. If one of the keys work, while not a likely thing to happen, I cannot think of anything else, but a RFID chip going bad.

[lost_soul]

correct, they are in different parts of the fob, and have no connection whatsoever. If one of the keys work, while not a likely thing to happen, I cannot think of anything else, but a RFID chip going bad.

I see, so is this like a chip I can buy or let dealer handle everything type of fix.

[V1nny]

https://www.ebay.com/itm/Remote-key-...T/123112190840

https://www.ebay.com/itm/4-Button-Fl...8/131162696928

this supposedly has new chip, T6, MEG/CR ID48 that can be matched to any A6.

[lost_soul]

https://www.ebay.com/itm/Remote-key-...T/123112190840

https://www.ebay.com/itm/4-Button-Fl...8/131162696928

this supposedly has new chip, T6, MEG/CR ID48 that can be matched to any A6.

umm. will this work is the question, im guessing it will have to be programmed doesnt really say much i msged the seller hopefully he knows ... thanks

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