Help! My EPC (Emissions) or CEL (Check Engine Lamp) is on.

There's a very simple thing to check first: your brakelights. If they don't work, check the brake pedal switch. It's a common fault. Also have a look for anything obvious like a loose or failed HT lead, or an audible air leak if that's appropriate for your car.

Other than that, you really need to get your car scanned by someone with VAG-COM (VCDS), a VAS computer (the one dealers have), or a OBD-II scanner.

Of these, the VAS or VCDS/VAG-COM is your best bet as it can read and decode more faults from the car.

You have several ways of getting the car scanned:

* You can pay a Skoda (or other VAG) dealer. Typically this will cost at least £40.

* You can pay an independent garage. This will be a bit cheaper, but unless the garage specialises in VAG cars, it will probably only have a generic scanner.

* You can ask here in the VAG-COM and diagnostics forum. Look at the member map. If there's someone near you, send them a PM, and negotiate a price- which may just be a pint or two.

* You could obtain VAG-COM/VCDS or a code reader yourself. This can cost as little as £20ish for an ebay cable and a limited downloadable version of VAG-COM, but a fully licenced version (with full capability and support from Ross-Tech) costs more.

For later cars (Octavia II and Superb II), you need a CAN-capable scanner or a version of VAG-COM and appropriate genuine Ross-Tech cable that supports CAN-only cars.

A scan really is the only way to try to diagnose a CEL/EPC light, and often odd running problems as well. If you post the logs from the scanner on this site, someone will have a chance of solving your problem. Otherwise, it's just wild guesswork and you could be checking and changing things for ever.

Or it is a faulty exhaust pressure sensor, that one which evaluates pressure drop across DPF.

It's a black plastic module with 2 pipes coming from it at the top lefthand side of the engine bay just behind the plastic engine cover. Part No. 076906051A from seat/skoda/vw/audi.

I got the faulty sensor (which determined EPC light, then DPF light, then general engine anomaly) changed with no probs under warranty by my Skoda dealer.

HTH,

Stefano

Does anyone have a list of values / specs of the readings you can get from the VAG5053+ on a Skoda Superb 2.0 TDI, 170 HP ? What should for instance the readings be for group 097?

Hope you can help.

I had this warning light and it was the exhaust gas pressure sensor thing under the bonnet. The VAG tech who came out was really good and told me that this was quite a common fault. While not a massive issue, the faulty sensor might cause the system to try and shut down, even though there was no reall problem.

Fixed in the car park on site in about 30mins

I had a similar issue last weekend on my 2009 Superb II TdI 170, got dpf warning light first, then the glow plug light started flashing and the power was cut into limp home mode. First restart and a blast down the M1 seemed to clear it but soon as hit standing traffic got both lights back then a 3rd light which turned out to be the exhaust system pressure sensor fault. Anyway, Bickerton in Sheffield sorted it and even threw in a loan car at short notice while they got the part overnight. Not sure what it cost as mine is a lease car but first fault in 65k is not bad. Last car was a Passat and it had over £5k of warranty work in less than 3 years!

Anyone got an Android/iPhone ELM reader using Torque to work yet?

My mate has one called Xtools and that reads a VW

Brother has 2012 superb estate greenline 1.6, got curly red warning light up and then ecu light and no power,,??

Now diagnosed as EGR valve..

G

Edited 9 January, 20197 yr by FlyingSpanner

On 15/06/2009 at 22:13, cjb said:

Help! My EPC (Emissions) or CEL (Check Engine Lamp) is on.

* You could obtain VAG-COM/VCDS or a code reader yourself. This can cost as little as £20ish for an ebay cable and a limited downloadable version of VAG-COM, but a fully licenced version (with full capability and support from Ross-Tech) costs more.

For later cars (Octavia II and Superb II), you need a CAN-capable scanner or a version of VAG-COM and appropriate genuine Ross-Tech cable that supports CAN-only cars.

A scan really is the only way to try to diagnose a CEL/EPC light, and often odd running problems as well. If you post the logs from the scanner on this site, someone will have a chance of solving your problem. Otherwise, it's just wild guesswork and you could be checking and changing things for ever.

 

My car is a 2013 Superb 2 diesel estate Elegance model, I should stress that there is nothing wrong with it (and I keep it well maintained by a local independent garage). I would quite like to have the ability to diagnose and fix things if they go wrong in the future though, so I thought I might procure a scanner like the one described by @cjb above.

I just had a look on Fleabay and can see that a Vgate VS890 Maxiscan OBD2 CAN Car BUS Fault Reader Code Scanner Diagnostic Tool only costs about £23, would that model be suitable for my car? If so I'll just order one, it would be worth having in the garage.

 

Alan

I had this come up. Turned out to be Glow plug no 3 open circuit and the Throttle pedal assembly. All fixed and no stupid emissions warnings.

Mine turned out to be fuse number 13 in the cabin fuse box.