Hello everyone, I am a new owner of a 2012 Skoda Fabia Combi 1.6tdi with 43,000 on the clock.  I have just taken it for the first test since I bought it earlier this year.  It failed!  

 

After replacing all the tyres (5), I am now left with one item to resolve before 16th January and wonder if anyone can please advise?  The  failure was section 8.2.22.c.2.  "The reading of the OBD indicates an important dysfunction".    The readings for the emissions were fine on the test report.  The tester informed me that this problem is that, on start up, the 'engine' symbol (which I believe is the 'EML' or 'Exhaust inspection System' light) should flick on briefly when the ignition is turned.  This doesn't happen.  If the vehicle system does a check before starting then it misses this one.  The car is running well and apart from the brief appearance of the emissions warning light a few weeks ago, has had no problems.  I did buy a bottle of fuel additive and added that to the diesel and the engine seems a little smoother.   Does anyone please have any experience with this?

On Tuesday the car is booked in for an 'engine flush' which I understand cleans out the systems, and attempts to recoup the EGR / PAP.   I wonder if it is possibly the lambda sensor or one of the oxygen sensors?  My husband bought himself a cheapie chinese OBD reader and that doesn't seem to show anything.  The local garage tried and he got an error code of P242500 which seems to relate to emissions but nothing else, but the emissions passed the test with an average reading of 0.10.. I am confused!  i'd be grateful for any advice anyone can offer.  Thank you

 

 

Your problem (at least for the purposes of the MOT test) is the lack of an engine management light (EML) on start up. This doesn't in itself indicate a fault, but it does mean a failure of the test as this light is supposed to work. 

 

So don't be trying to fix a fault with the engine or exhaust emissions stuff, because the fault doesn't lie there. You need to find out why the EML isn't working. That may be simply a failure of the led for that particular light, or more sinister someone has mapped out the EML to hide an expensive fault which they didn't want to fix.

9 minutes ago, Rustynuts said:

Your problem (at least for the purposes of the MOT test) is the lack of an engine management light (EML) on start up. This doesn't in itself indicate a fault, but it does mean a failure of the test as this light is supposed to work. 

 

So don't be trying to fix a fault with the engine or exhaust emissions stuff, because the fault doesn't lie there. You need to find out why the EML isn't working. That may be simply a failure of the led for that particular light, or more sinister someone has mapped out the EML to hide an expensive fault which they didn't want to fix.

Thanks.  I had it booked in for an engine flush this afternoon (Decalaminage) but they were apparently unable to do it because of the car having an electric fan.  However, the company did report back to me on what the fault reading actually was - P2425: 'Vanne de defroidissement, recyclage des gaz d'echappement:  Court circuit au pole positif'.  ( EGR, recycling of exhaust gas: short circuit on the positive side.)    So it's very strange that i didn't receive a warning light and also, the readings for the controle were well within the limits, an average of 0.10.  I admit to being really baffled about this.  surely if there EGR was faulty, then the exhaust readings would be high?  I know when my EGR went on the laguna, we were almost being suffocated with fumes inside the car!  

The receptionist / mechanic at the main Skoda dealer this afternoon asked if i'd seen the warning light.  I explained, no, no light at all at any time...   He shrugged, (no doubt thinking typical female!), and asked if my car was there and could he please have the keys.  I gave them to him and he disappeared for 10 minutes, coming back shrugging his shoulders and muttering 'c'est bizarre!'  he had no idea why no light appeared either.  it is now booked in for a computer test on 14/12/20.  I have until 16/01/21 to get it sorted before I am off the road.. :(  

I appreciate any comments or suggestions on this problem, however obvious they may seem to you because it doesn't make sense to me!  As you said, all, I can think of is that someone has blanked off that light.

14 hours ago, Gillm said:

Thanks.  I had it booked in for an engine flush this afternoon (Decalaminage) but they were apparently unable to do it because of the car having an electric fan.

I'm going to call BS on that "excuse" as the vast majority of cars for the last 10+ years have electric fans.

Quote

So it's very strange that i didn't receive a warning light

... which fits with what most of us are suspecting which is that a previous owner has disabled/covered/removed the EML light to disguise the fact there is a problem.

Yes Dave, so Monday afternoon should disclose everything because its booked into skoda for a diagnostic.  🤞Cf

8 minutes ago, Gillm said:

Yes Dave, so Monday afternoon should disclose everything because its booked into skoda for a diagnostic.  🤞Cf

Please let us know what the Skoda dealer tells you after the diagnostic.

I will indeed do that in the hope that the results of what is found may help others who could find themselves in the same situation.  

Did you buy it from main dealers or private?

A private sale.  Had I bought it from a garage or main dealer, this problem would never have arisen.  An expensive and hard lesson to learn..