Author Topic: C4 Check engine light not working/ vag-com not detecting  (Read 803 times)

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Offline zeitgeist

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C4 Check engine light not working/ vag-com not detecting
« on: August 01, 2013, 02:18:32 pm »
I have a C4 S6 with old style 2+2 OBD1 connection.

My Ebay cable+VCDS lite used to work fine on my C4 S4, but now not on the S6.

Something interesting is that I can't flash the codes through the check engine light by jumping the two for'd OBD pins. I could do it on both my S4s. Unplugging the TPS does not turn the light on as it should either. The fuse is OK.

Can anyone shed light on this?

EDIT: Pulled the instrument cluster, and there is no check engine light fitted. So I guess it's back to the idea that some electronics between the laptop and cable are stuffed. Have tried all settings etc.
« Last Edit: August 01, 2013, 03:02:41 pm by zeitgeist »
UrS6 6 speed

Offline Andy_007

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Re: C4 Check engine light not working/ vag-com not detecting
« Reply #1 on: August 01, 2013, 09:03:19 pm »
Check the fuses above the ECU, i think theres one of the OBD. The 3 C4's ive got dont have the check engine light fitted but my parts car with the 30V V6 has a functioning check engine light, it is a very late model.
2007 Audii A4 Quattro 3.0TDI

Offline zeitgeist

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Re: C4 Check engine light not working/ vag-com not detecting
« Reply #2 on: August 02, 2013, 01:11:31 am »
Cheers for that, I did have a look at those fuses and all are ok :(

Meh, car seems fine so shan't worry.

UrS6 6 speed