EML and EPC light on dash

yatz

yatz

Member
Hi All,

I was driving to work this morning and the EML and EPC light appeared on the dash, car seemed to drive ok. When I got to work I turned the engine off and back on, the EML light stayed on but the EPC light went out. Any ideas?

Is there anyone around the Kingston Upon Thames/SW London area that has VAG-COM and wouldnt mind hooking up my car to get a read of any fault codes that might be stored.

Regards

Yatin
 
that would be of great help, thanks !!

I will send you a PM for you to forward your contact details to

regards

Yatin
 
I have a 1.6 FSI. The EML light came on on mine today and wont go out. What are the main reasons why the EML come on. Is it serious

Regards,

Fergusview
 
Fergusview said:
I have a 1.6 FSI. The EML light came on on mine today and wont go out. What are the main reasons why the EML come on. Is it serious

Regards,

Fergusview
Click to expand...

I think any fault related to poor combustion can trigger the EML light. There are so many possible causes - from coil packs or plugs, fuelling / injectors, combustion air/ intake manifold flap to the NOX or lambda sensors etc that a diagnostic scan is the only way forward.

Cheers Spike
 
Hi All,

Well the EPC and EML lights still come on intermittently so I had the car scanned at a VW/Audi Specialist garage in Leatherhead, Surrey. The mechanic was very surprised when he looked at the logs and they were ALL empty. The EML and EPC light have come on/off about 6 or 7 times overs the last 3 months, but they were not logged, making it more difficult to establish what the fault is!

One aspect he did mention was that even though the temperature gauge in the car was displaying 90C, the VAGCOM was displaying 83C, could it possibly be a faulty temperature sender making the lights come on? I replaced the sender myself about 2 years ago. I find that it does take about 5-10 minutes of driving to get the gauge upto 90C.

Any ideas why the faults have not been logged?

Yatz
 
That temperature reading is normal

When the coolant is between 80 deg C and 100 deg C it will always show as 90 deg C on the dash. Is how its programmed.

Also in this chilly weather it will take a fair while for the temp to rise, so I doubt its the temp sender.

John
 
Thanks for the reply John, I was thinking the same with regards to the chilly weather, also I only replaced the temp sender a ~18 months ago.

Any ideas on why the faults codes are not being logged? Its a bit worrying to be honest. Being a Systems Engineer and looking at fault history logs on a daily basis, I would say that they are a critical part of any system. Possibly CCU issue?

Yatz
 
I read somewhere on this forum that the throttle can become clogged with grime and this can lead to the EPC light coming on. Is it worth a shot asking my mechanic to clean the throttle. Im guessing this would be a good starting point before changing various sensors around the car. Seeing as the error codes are not being logged, it is almost impossible to calculate which sensor has become faulty.

Cheers

Yatz
 
It should be logging the fault codes even if they are intermittent.

Do you know if they scanned all the control modules??

Each module stores its fault codes and then when a full scan is done it accessess each module and pulls the codes.

If they only scanned say the engine module it would only report any codes from that if you get what im saying.

The CCU will only log its own faults - not the whole cars. I think each module reports to the dash panel insert where the diagnostic memory is stored.

John
 
The mechanic looked at all the modules to see whether any fault codes were logged, he said that they were all empty.

I have found that the EML and EPC light only come on when I am crawling in first gear. I just have this feeling that the throttle is at fault here. Throttle position sensor maybe? any ideas what causes the EPC light to activate, Im I right in thinking that EPC is Engine Power Control?

Cheers

Yatz
 
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