11 minutes ago, J.R. said:

the importance for me is to see it switching fairly frequently, is that no longer good practice?

 

On a traditional sensor, yes. On a wideband sensor, no.

 

I posted the workshop manual info before, but here it is again, I think somewhere previously it mentioned a pre-requisite of the engine being up to temperature, but my experience is that it gets to the quoted number and maintains it from with a minute approx. of cold start. :

 

He is a pic of the o2 sensors graph

Could do with reading the voltage on precat sensor with VCDS instead to see if it's just that app which is reading it wrongly 

I add that tomorrow when I'm neighbor is in unless you can do it on vcds lite and how do you get to the option? Thanks

I think VCDS Lite does it, cos that's all I have. Engine ECU measuring block 033.

Ok I do that and post it Thanks 

Update went to a different garage due my local mot guy breaking his foot. Anyway He said its the catalytic converter thats had it so now have to change that and take it back. If it's fails after the cat change then selling it or scraping it doing my head in 

1 hour ago, Mobear said:

Update went to a different garage due my local mot guy breaking his foot. Anyway He said its the catalytic converter thats had it so now have to change that and take it back. If it's fails after the cat change then selling it or scraping it doing my head in 

 

I thought this was the pre cat sensor, no?

1 minute ago, sepulchrave said:

 

I thought this was the pre cat sensor, no?

Yea it was but what the second guy I went to said its not 02 sensor as he hooked it up to a obd reader and said both sensors are fine and he said its the catalytic converter and do you or anyone have a part number for the catalytic converter 

Skoda fabia 1.4 16v 2005 bky engine

Plus does anyone know how I can test if its the catalytic converter Thanks

2 minutes ago, Mobear said:

Plus does anyone know how I can test if its the catalytic converter Thanks

The readings off the scanner, pressure gauge readings off the exhaust, tap the cat to see if you can hear rattle of broken bits.

 

What made the different garage say it was the cat, did they give an explanation or show you readings or tell you gauge readings?

 

I too lost track of which sensor was being referred over yo the thread, but I'm easily confused.

 

(time for my tea)

 

Manicat on that engine is expensive, I would expect the emissions to be way out of spec. And therefore the EPC light and CEL to be lit as well as B1 S2 O2 sensor out of range fault code.

I asked him what is the problem he said its the cat thats failed and when he done the mot test he said he tried it 5 times in different ways but the reading were high and it smells from the exhaust which he said is a sign of dead/ broken cat letting out harmful emissions and he said as the car is only used for around town at low speeds the cat gets clogged up and dies quicker plus got no error codes or lights on and found an cat on ebay for £100 I know its an aftermarket one but will be selling the car in six months so not bothered if it done last long 

Did he even realise that there are two cats?

45 minutes ago, sepulchrave said:

Manicat on that engine is expensive, I would expect the emissions to be way out of spec. And therefore the EPC light and CEL to be lit as well as B1 S2 O2 sensor out of range fault code.

And the cat is in the middle of the car not on the manifold which I seen from the ebay pics I circled the cat on my car which I was told by the seller 

1 minute ago, Pete_Ex-Wino said:

Did he even realise that there are two cats?

No he never told me so is the other one with a Manicat 

The other one is integrated with the exhaust manifold, yes.

Ask him if he's confident enough about his diagnosis that he'll not charge you for it if it doesn't fix it.

This has completely spiralled out of control, if the car has failed on emissions there should be a readout from the gas analyser stapled to the fail sheet. Please post a picture so we can clearly see the readings.

5 minutes ago, Pete_Ex-Wino said:

The other one is integrated with the exhaust manifold, yes.

Ask him if he's confident enough about his diagnosis that he'll not charge you for it if it doesn't fix it.

Thanks I ask him for the print out plus which cat he meant and I do all the work myself as then I know its done properly

Actually, it's a BKY engine is it? In which case the other cat is at the top end of the first section, unless it's already an aftermarket one on there.

Just now, Pete_Ex-Wino said:

Actually, it's a BKY engine is it? In which case the other cat is at the top end of the first section, unless it's already an aftermarket one on there.

Yes its a bky engine and the top end of the 1st section is where the manifold is. And its an original exhaust have you got any photos of the full exhaust system 

4 minutes ago, sepulchrave said:

This has completely spiralled out of control, if the car has failed on emissions there should be a readout from the gas analyser stapled to the fail sheet. Please post a picture so we can clearly see the readings.

Yea I know i feel like scrapping the car and I'm getting the readout tomorrow 

36 minutes ago, Mobear said:

got any photos of the full exhaust system 

This is the original from my other (manual transmission, BKY engine) Polo:

 

I don't remember seeing an aftermarket replacement that has the little pre-cat at the top.

 

1 hour ago, Mobear said:

I asked him what is the problem he said its the cat thats failed and when he done the mot test he said he tried it 5 times in different ways but the reading were high and it smells from the exhaust which he said is a sign of dead/ broken cat letting out harmful emissions and he said as the car is only used for around town at low speeds the cat gets clogged up and dies quicker plus got no error codes or lights on

Sorry I was lost, I thought you got your MoT last week - to be fair it sounds like this MoT tester gave you a more than fair chance.  As you've found lack of error codes and warning lights doesn't always mean there's nothing wrong, your eyes and nose can sometimes be more reliable than app scanners.

 

But all might not be lost.

 

24 minutes ago, Pete_Ex-Wino said:

This is the original from my other (manual transmission, BKY engine) Polo:

 

I don't remember seeing an aftermarket replacement that has the little pre-cat at the top.

 

this is the one I'm buying i ask the seller if there is a manifold cat 

1 hour ago, Mobear said:

it smells from the exhaust

Of what? That can be very diagnostic.