Afternoon all, hope everyone is well?

Bit of a head scratcher for me, and im after some advice from those in the know please!

Bit of context i did a service on our Rapid 1.2 Tsi the other day (as i have done countless times before!) filters, oil, spark plugs etc., and its running as it always has, no issues to speak of. A few days later i've noticed a smell of fumes entering the cabin, especially when standing. Ive had another look today and found one of the spring clips not fully fitted correctly, and have now rectified this which has lessened it, but the good lady reports still smelling fumes but to a lesser degree. Now ive seen alot of speak about a non return valve on the crank case breather, being the cause of this but all of the guides i have seen (although excellent!) dont seem to match my engine. Does anyone have the copy of the workshop manual for the rapid per chance?

Ive looked at a parts catalogue site, i was very kindly pointed in the direction of from here for my Octavia (LLL Parts), but the rapid sections all seem to be 1.0l or 1.5/1.6 engines, non of which look similar? would a Fabia of the same era share the same engine?

im looking for the location of the breather valve (If it still exists on this engine!) and the guides mention on the engines they are showing its below pipe leading to the turbo, i cannot see it on mine. there is a breather hose leading from the air box, to the cylinder head cover via a valve seated in the block, am i correct in saying this is an EGR valve, or is this the valve im actually looking for!

Apologies for the vagueness of the above, hopefully someone will be able to decipher it into some sense! the reg if it helps is VE65YOK.

Many thanks in advance

cheers all, Nick

Is this what you need?

5 minutes ago, inspectorman said:

Is this what you need?

Inspectorman,

Thanks for the reply and the link. this is one of the guides i was alluding too in the original post. Excellent guide, but it doesn't seem to be the same engine as ours (despite being a 1.2Tsi as well), but yes you are correct this is exactly the thing i am trying to find on ours!

ive looked below the piping (admitidly without removing it all, as time was against me!) but everything seems to be fairly visible and i cant figure out where it would be under there, there are also no tell tale signs of oil spray as in those guides.

Thanks again

Be sure it s not the only too common Fuel Rail issue. Broken mounting bolts. DVSA / DfT not interested, seemingly leaking petrol not 'Safety Critical.

3 hours ago, Evolution13 said:

Be sure it s not the only too common Fuel Rail issue. Broken mounting bolts. DVSA / DfT not interested, seemingly leaking petrol not 'Safety Critical.

Evolution 13,

Thanks for the reply. That was also on my thoughts list, however wouldn't you be able to smell strong petrol fumes with that under the bonnet? The ones I've read about also note a rapid decline in fuel as it leaks out, and a hefty leak when started. I did think about re-checking the spark plug wells, as I read they fill with fuel if this is issue arises?

Filled the car not long after servicing it (another possible was over filling it at the pump which has caused fumes, but I've not done that) and the fuel consumption etc has been spot on.

Thanks again for the reply

Can you message me with the VIN?

My way of finding VIN from reg no longer works.

I suspect you may have one of the next generation of belt-driven 1.2 TSIs rather than the chain-driven version these guides are showing.

@goatus , did you take the "charge" pipe off to reach cylinder 4 coil and so plug?

If so, maybe you have torn/damaged the sealing ring either at the turbo outlet end or the throttle body end.

The workshop manual does state that these O-rings should be replaced if that charge pipe is removed. If there is a leak there, eventually some traces of engine oil/mist will start to build up on the end which is leaking slightly.

6 hours ago, Breezy_Pete said:

Can you message me with the VIN?

My way of finding VIN from reg no longer works.

I suspect you may have one of the next generation of belt-driven 1.2 TSIs rather than the chain-driven version these guides are showing.

Morning Pete, sorry for the late reply, just come off shift! I'll get the VIN later if I get chance, however you are correct, it's belt not chain.

Thanks for the reply and help

Nick

4 hours ago, rum4mo said:

4 hours ago, rum4mo said:

@goatus , did you take the "charge" pipe off to reach cylinder 4 coil and so plug?

If so, maybe you have torn/damaged the sealing ring either at the turbo outlet end or the throttle body end.

The workshop manual does state that these O-rings should be replaced if that charge pipe is removed. If there is a leak there, eventually some traces of engine oil/mist will start to build up on the end which is leaking slightly.

4 hours ago, rum4mo said:

@goatus , did you take the "charge" pipe off to reach cylinder 4 coil and so plug?

If so, maybe you have torn/damaged the sealing ring either at the turbo outlet end or the throttle body end.

The workshop manual does state that these O-rings should be replaced if that charge pipe is removed. If there is a leak there, eventually some traces of engine oil/mist will start to build up on the end which is leaking slightly.

Morning rum4mo, thanks for the reply. So on mine the "charge pipe" as such if I'm thinking of the right one, dosent need to be removed to access plug 4, there is another pipe from the air box however and that is the one I refitted properly today that does need a section removing to get at no4. This however is all plastic to plastic piping rather than throttle body or turbo connections. The guides I've seen say to remove the charge pipe, which I've not done as yet, but I shall bear that in mind if I end up doing so! Thanks again for the helpful reply.

Edited 14 February14 Feb by goatus

11 hours ago, goatus said:

Morning Pete, sorry for the late reply, just come off shift! I'll get the VIN later if I get chance, however you are correct, it's belt not chain.

Thanks for the reply and help

Nick

Afternoon Pete, sorry again for the time taken to reply

Vin is included as a picture 👍

Many thanks again

VIN removed
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@goatus the VIN was only to allow me to confirm that you have the later version of 1.2 TSI.

You have done that yourself, so I can't really help further, except to say that this later version almost certainly has a different arrangement of PCV-related pipework, valves and connections.

So trying to reference the earlier 'how to' threads is unlikely to assist you much.

1 hour ago, Breezy_Pete said:

@goatus the VIN was only to allow me to confirm that you have the later version of 1.2 TSI.

You have done that yourself, so I can't really help further, except to say that this later version almost certainly has a different arrangement of PCV-related pipework, valves and connections.

So trying to reference the earlier 'how to' threads is unlikely to assist you much.

Thanks again Pete, I shall continue the search 😄

Cheers 👍

The charge pipe that I was referring to is the one that is nearest the gearbox end of the engine. From memory, you are meant to use a bespoke tool to "spring out" the retaining bands on that pipe - as opposed to the usual "pipe clip" pliers or even water pump plier that get used to remove the tube associated with the air filter assembly.

I just thought, when I changed the plugs the first time, that taking that charge pipe off would improve access and so minimise the possibility of any plastic bits getting damaged - so when I replaced the spark plugs the second time, I also replaced that charge pipe and so replaced the O-ring seal at both ends.

On 14/02/2026 at 17:12, rum4mo said:

The charge pipe that I was referring to is the one that is nearest the gearbox end of the engine. From memory, you are meant to use a bespoke tool to "spring out" the retaining bands on that pipe - as opposed to the usual "pipe clip" pliers or even water pump plier that get used to remove the tube associated with the air filter assembly.

I just thought, when I changed the plugs the first time, that taking that charge pipe off would improve access and so minimise the possibility of any plastic bits getting damaged - so when I replaced the spark plugs the second time, I also replaced that charge pipe and so replaced the O-ring seal at both ends.

Thanks again rum4mo for the reply. Ok, so I've included a picture of my engine for avoidance of doubt. The 2 circled in red are the 2 I removed to get the box out. The bottom is the air feed from outside to the box, and the top red circled pipe was the one I had a bit of trouble getting out and back this time (spring clips!) I've since re-seated this properly after getting a decent set of spring clip pliers! Am I right in thinking the yellow circled pipe is the boost pipe you speak of?

On the older engine guides the one way valve is under this but can't see any, and as we've now figured, mine is the later belt driven 1.2tsi rather than the early chain driven in the guides.

After re seating the pipe mentioned above it has improved it slightly but it seems to be at a stand when the issue re occurs 🙄.

Thanks for the continued help, think the next step is to get it all off again and re-check the plugs etc - but it's running fine 🤔

Thanks again

Nick

@goatus , yes, it was the charge pipe you've circled in yellow that I was referring to, and now I can see and so remember, that that charge pipe is retained by plastic lugs which get eased out using a tapered U shaped tool - not that this should interest you now, but I'm just clarifying what I should have written in my previous posting - and so there are no rubber O-ring seals associated with the air tube connectors that you removed - and also lesser reason for what you did being to blame for the smell of fuel/oil fumes, unless there is a small air hose that connects to the bottom of the air filter assembly box - I've forgotten if there is one, but I think that there is a preformed one that has fabric protection covering it to prevent it chaffing on "stuff".

Edited 15 February15 Feb by rum4mo

36 minutes ago, rum4mo said:

@goatus , yes, it was the charge pipe you've circled in yellow that I was referring to, and now I can see and so remember, that that charge pipe is retained by plastic lugs which get eased out using a tapered U shaped tool - not that this should interest you now, but I'm just clarifying what I should have written in my previous posting - and so there are no rubber O-ring seals associated with the air tube connectors that you removed - and also lesser reason for what you did being to blame for the smell of fuel/oil fumes, unless there is a small air hose that connects to the bottom of the air filter assembly box - I've forgotten if there is one, but I think that there is a preformed one that has fabric protection covering it to prevent it chaffing on "stuff".

Another thing I had noticed, when removing that top pipe, there is (as you say) a pipe that is protected by a foam lagging. That is becoming a bit rough in places, but I can't see that allowing anything in to the system fume wise 🤔.

I'll have to have a dig again tomorrow and see if I can unearth anything. Is a real shame that any factory manual I can find is all down to the 2014 version, and even then not engine related!

Thanks again for the continued help, it really is much appreciated 🙂

Ah, yes, "foam lagging" not "fabric", now that you've reminded me, it does tend to look distressed, but is that not just an intended bit of "shaping" so that it fits into the space that it does.

From memory, that pipe is probably a crankcase purging pipe so it probably gets connected to the underside - or side of the air filter assembly - unless you know otherwise by your recent access to under there.

Edit:- I bought a copy of the official workshop manual from easymanuals.co.uk who just grab a copy from eWin online and sell them on. That worked for me for a 2011 Audi S4 and a 2015 VW Polo 1.2TSI 110PS.

Edited 15 February15 Feb by rum4mo
added in "or side"

Nick, what's your 1.2 TSI engine code?

Having looked at an online parts listing, I've remembered that the crankcase purging pipe is the small one showing on your picture to the left (in that picture view) of the air filter tube you have circled in red that has the resonator/damper build onto it. That pipe connects between the rear of the air filter assembly and the "air valve" on the top of the cam shaft chest.

Edited 15 February15 Feb by rum4mo

1 hour ago, nta16 said:

Nick, what's your 1.2 TSI engine code?

Hiya Nta,

Not sure off hand but I can try and find it tomorrow if I get chance 👍

Thanks for the reply 🙂

1 hour ago, rum4mo said:

Ah, yes, "foam lagging" not "fabric", now that you've reminded me, it does tend to look distressed, but is that not just an intended bit of "shaping" so that it fits into the space that it does.

From memory, that pipe is probably a crankcase purging pipe so it probably gets connected to the underside - or side of the air filter assembly - unless you know otherwise by your recent access to under there.

Edit:- I bought a copy of the official workshop manual from easymanuals.co.uk who just grab a copy from eWin online and sell them on. That worked for me for a 2011 Audi S4 and a 2015 VW Polo 1.2TSI 110PS.

Yes it does look thater distressed, however mine has a few nicks out of it where the bloody spring clip dug into it 😬, but still it wouldn't pierce the pipe being protected I shouldn't think 🤔.

Thanks for the suggestion on the manual front I'll have a mooch at that!

1 hour ago, rum4mo said:

Having looked at an online parts listing, I've remembered that the crankcase purging pipe is the small one showing on your picture to the left (in that picture view) of the air filter tube you have circled in red that has the resonator/damper build onto it. That pipe connects between the rear of the air filter assembly and the "air valve" on the top of the cam shaft chest.

That is exactly what I was guessing, again that was taken off to remove the air box, I have had a look and it doesn't seem problematic, but I could take the pipe off completely to inspect. Not sure of that air valve could be the issue 🤔. Not sure how it's attached into the camshaft chest as it doesn'thave any attachment device, or is it a push fit?

Many thanks again

1 hour ago, nta16 said:

Nick, what's your 1.2 TSI engine code?

Just had a look at the V5, it's a CJZD 👍

Many thanks

Nick

Nick I thought it might be as it looks similar to the engine in my wife's 2015 Fabia Mk3, which is a CJZC.

Here's a link to Workshop Manuals that might help you identify parts and locations, if not I can give you the one for the Fabia Mk3 CJZC/D engine. - https://cardiagn.com/skoda/skoda-rapid/

HTH.

The "air valve looks to be a "push fit", like snapped into place.

That other pipe that has the black foam over it might even be a steel pipe, so I don't think that it will be causing a problem, I've forgotten what it's function is, maybe just the low pressure fuel feed to the high pressure fuel pump.

4 hours ago, nta16 said:

Nick I thought it might be as it looks similar to the engine in my wife's 2015 Fabia Mk3, which is a CJZC.

Here's a link to Workshop Manuals that might help you identify parts and locations, if not I can give you the one for the Fabia Mk3 CJZC/D engine. - https://cardiagn.com/skoda/skoda-rapid/

HTH.

Hi Nigel,

Thanks very much for the manual link! I've managed to get it to work (after it telling me i has to be in the USA etc etc etc) and there's definitely a lot to browse! Next time i get a chance to go over the car, i shall go armed with that! That's a really big help!

Thanks again much appreciated, when (or if!) i do eventually find the cause i shall be sure to share!