[atikovi]

The check engine light on my '04 V10 came on but when I scanned it there were no faults in the engine or transmission. I did an erase anyway but the light is still on. Why is the light on and how do I get it off? I was all excited about having fixed the TPMS system and now this comes up.

 

[wvicary]

What scan tool are you using to read the codes?

 

[atikovi]

Programa

 

[wvicary]

That could be the problem. Many off the shelf scan tools can only access OBD-2 codes for emissions related faults which is only a small fraction of the possible faults which could trigger a check engine light. I highly recommend Ross-Tech VAG COM.

 

[atikovi]

What do you mean off the shelf? This is a $3,000+ scan tool that independent repair shops use which does just about everything a VW dealer VAS tool does.

 

[AndrieK]

What do you mean off the shelf? This is a $3,000+ scan tool that independent repair shops use which does just about everything a VW dealer VAS tool does.

Apparently not...

It would be interesting to know if the VAG-COM tool can read something the Programa one can't...

 

[wvicary]

I'm not slagging your scanner. If the light is on then you have a fault and it might take the factory scan tool to discover it. You might try scanning all modules for codes to see if they shows any fault like a poor communication with the instrument cluster. Are there any starting or drivability problems?

 

[atikovi]

Starts and runs great.

 

[wvicary]

I can only suggest finding someone with VAG-COM or the dealer to scan for codes. I have seen some after market scan tools not be able to access all codes present or even cause communication to stall on the CANBUS.