Hi Members, First of all I would like to thank you all who helped me in fixing and diagnosing many issues in my fabia mk2.

Now coming to the issue. I own a skoda fabia mk2 1.2htp petrol 12V CEVA engine. Somewhere aroud a year back I started to notice the EPC light coming on randomly. Below are my observations.

1- If I start the engine and drive it without AC then the epc light doesn't comes on but if I use the AC it comes on little early.

2- The easiest way to get the epc light glow is If I drive to somewhere and keep it in idle the epc light glows withing 5 mins(maybe due to overheating?)

3- Whenever the epc light glows I the idle is fine but only in gear acceleration suffers (the acceleration behaves oddly like loosing power  withing seconds and I let the gas pedal go and press it again to gain power which makes the engine jerks )

4- Another thing which I noticed is Whenever the epc light is on only in gear acceleration suffers if I put it in neutral the acceleration and idle seems fine.

 

To diagnose this I've used my bluetooth obd2 adapter and Torque app immediately whenever the epc light glows but there is no error code even not any temporary code.

Only thing I did to drive by wire was putting wd40 in the acceleration pedal a year back which I am suspecting recently opened the drive my wire accelerator motor which looked fine.

 

Any help is appreciated.

 

 

 

There may be an emissions related VAG DTC code which your app cannot show, judging from your symptoms you have an air leak in the inlet, check the brake servo vacuum line for cracks or splits and the PCV system too.

Thank you for your inputs @sepulchrave:

As per your suggestion I've inspected the brake servo vaccum line which looks fine with no visible breaking. 

But when I started the engine to see if I can hear any leaks but there were nothing I can hear so further inspection on the PCV there is a slight hissing which I can hear.

 But one issue which I found was when In idle If i remove the oil level gauge there is a slight change in idle RPM with slight compression leak. But If I open the oil filler cap in  the engine there is ahuge air leak and the engine losses too much power and sounds like its gonna stall I have added the idle video.

I suspect the PCV valve could be the culprit.

Any info on how to open the PCV vaves to inspect the diaphragm?

If PCV needs to be replaced can I just replace the diaphragm as shon in some videos or the whole unit? 

 

There's a pressure equalising port/hole in the cap of the PCV, red arrow pointing at it in this photo.  Find a way to block that while the engine is running and see whether it affects the idle speed or smoothness.  It should not.   If the idle changes, the valve needs replacement.  

 

 

Hi @Wino Thanks for you inputs.

When I tried to block the hole using a wire it didn't make any change in the idle rpm. But If I remove the oil cap the engine almost dies and the idle increases than normal. I couldn't post the video as I am out of quota.

Here is the screenshot of toruqe readings when I started the engine if it can be of any help.

Removal of the oil cap while the engine is running will, and should, make the engine struggle.

 

I can't picture a piece of wire being effective at blocking that hole.

Why not take the cap off carefully, then you can inspect the diaphragm inside, and re-fit it at a different angle to give better finger access to the hole.  There are just a few plastic ramp catches around the outside that hold the cap on.

To make a DIY fog machine for leak teating go to Youtube. They have several low cost suggestions.

 

To occlude the complete PCV just put a large enough cling film over the cap and after a short while any vacuum - if the membran is ruptured - will suck the cling film in.

On 12/02/2021 at 18:08, Wino said:

Removal of the oil cap while the engine is running will, and should, make the engine struggle.

 

I can't picture a piece of wire being effective at blocking that hole.

Why not take the cap off carefully, then you can inspect the diaphragm inside, and re-fit it at a different angle to give better finger access to the hole.  There are just a few plastic ramp catches around the outside that hold the cap on.

 

First of all apologies for my late reply as I was little occupied with my new job.

The wire fits perfectly with the hole which i thought is enough to block the air flow if any. 

Today I got some time to remove and check the PCV values. below are the pics, 

 

I dont think I can rotate the inlet hole as it wont fit :( :

 

The diaphragm was sticking to the cap guess it is not an issue:

 

 

The diaphragm  looks fine:

 

There is some oil in the bottom of the holder:

 

 

The diaphragm looks fine to me and I guess there was no much leak as from my earlier inspection, So is this could be any other issue? 

One more suggestion I need is there any cheap VAG-COM reader which atleast works for my fabia ? as the bluetooth app based doesn't give any error code for the EPC light?

OK, I guess that's all you can do with the PCV valve.

I've asked the question on here before about whether VCDS Lite plus third-party FTDI cable works on early Mk2s but received no response, so I don't know.  I think it might, but I have no friends or neighbours with a suitable car to check on.

 

 

I think all the Mark 2's are CAN and not K-line so it won't work.

I don't think that's necessarily the case, having looked at circuits.

I'll have another look while I have my lunch now.

Ok, it seems they're compatible with both diagnostic protocols.

Yeah I think it's well worth trying, as the circuitry between diagnostic connector and J533, the CAN gateway, looks to be the same on both, up until cars with start/stop at least.

 

 

Surely someone on here must already have the car and the kit to be able to try it?.... 

Edited 25 February, 20215 yr by Wino

Finally I was able to buy a HEX-V2 scanner and below is the autoscan results. I can see that the break switch intermittent issue. I have to mention here that I have retrofitted my break light bulbs with LED's will that cause this switch issue? As of now I will replace the LED bulbs with stock one and will check if it resolves the EPC issue.

 

Chassis Type: 5J (5J - Skoda Fabia (2007 > 2010))
Scan: 01 02 03 08 09 15 16 17 19 25 37 44 46 55 56 76 77
 
VIN: TMBBHH5XXXXXXXXXX   Mileage: 72610km-45117miles
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 03E-906-033-AZQ.lbl
   Part No: 03E 906 023 N
   Component: SIMOS91 1.2l 4V     3515  
   Revision: --H04---    Serial number: SKZ7Z0I5402287
   Coding: 0000071
   Shop #: WSC 01234 785 00200
   VCID: 2A5BB7AF86FFC0D47D-515A

1 Fault Found:
16955 - Brake Switch (F)
            P0571 - 008 - Implausible Signal - Intermittent
Readiness: 0010 0001

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 6R0-907-37x-ABS80.clb
   Part No SW: 6R0 907 379 J    HW: 6R0 907 379 J
   Component: ABS 8.0 front   H06 0003  
   Revision: 00000000    Serial number: 00000000000000
   Coding: 0002100
   Shop #: WSC 01234 785 00200
   VCID: 4581E4130FA10FAC70-515A

3 Faults Found:
00526 - Brake Light Switch (F)
            011 - Open Circuit
01314 - Engine Control Module
            004 - No Signal/Communication - Intermittent
18055 - Check Coding of ECUs on Powertrain Data Bus
            P1647 - 000 -  - Intermittent

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: None
   Part No: 5JF 820 045 C
   Component: Klimaanlage         00.9  
   VCID: 3B7582EB2965495C16-513C

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels:. 6Qx-937-049-C.lbl
   Part No: 6Q1 937 049 F
   Component: 0000 BN-SG.         2S36  
   Coding: 25742
   Shop #: WSC 01234  
   VCID: 3E738BFF3A775C7431-515A

2 Faults Found:
01314 - Engine Control Module
            49-10 - No Communications - Intermittent
01304 - Radio
            49-00 - No Communications

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 6Q0-909-605-VW5.lbl
   Part No: 1C0 909 605 K
   Component: S1 AIRBAG VW51      0011  
   Coding: 21297
   Shop #: WSC 01234  
   VCID: 2C57B1B7DC0BDEE48F-515A

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 5J0-920-xxx-17.clb
   Part No: 5J0 920 801 B
   Component: KOMBIINSTR.    V2802476  
   Coding: 16103
   Shop #: WSC 10039  
   VCID: 25414493BFE1EFAC50-515A

1 Fault Found:
01314 - Engine Control Module
            49-10 - No Communications - Intermittent

-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels: 6N0-909-901-19.lbl
   Part No: 6N0 909 901
   Component: 000J GATEWAY CAN    2S36  
   Coding: 00014
   Shop #: WSC 01234  
   VCID: 70EF65C730A3FA04F3-513C

2 Faults Found:
01314 - Engine Control Module
            49-10 - No Communications - Intermittent
01304 - Radio
            49-00 - No Communications

-------------------------------------------------------------------------------
Address 25: Immobilizer        Labels: 5J0-920-xxx-25.clb
   Part No: 5J0 920 801 B
   Component: IMMOBILIZER    V2802476  
   Coding: 16103
   Shop #: WSC 10039  
   VCID: 25414493BFE1EFAC50-515A
   TMBBHH5XXXXXXXXXX     SKZ7Z0I5402287

No fault code found.

-------------------------------------------------------------------------------
Address 44: Steering Assist        Labels: 6Q0-423-156.clb
   Part No: 6R0 423 156
   Component: LenkhilfeTRW        V272  
   Coding: 10140
   Shop #: WSC 01234  
   VCID: 6DD17CB3279117ECD8-515A

1 Fault Found:
01314 - Engine Control Module
            49-10 - No Communications - Intermittent

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels:. 6Q0-959-433.clb
   Part No: 5J0 959 433 A
   Component: 06 Komfortgerát     0001  
   Coding: 00019
   Shop #: WSC 01234  
   VCID: 3169A0C3FB29B30CBC-4B18

No fault code found.

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