Hi guys I've same across from fabia section so forgive me if its been mentioned before..

Right my boost!! It's going from 2 bar!!! To 1 bar back and forth on full throttle up and down up and down..

Now at idle it's idling lumpyikes it's going to cut out

Engine management light on also..

I can't get a computer on it atm so would like to know if there's any common issues on these thanks guys

Sumone!!!

To be honest no-one is going to know until you've got a fault code for us

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Po140 -02- sensor circuit

No activity detected bank 1 sensor 2

Po172 circuit malfunction bank 1 sensor 2

System too rich

I'm assuming it has somthing to do with decat and lamba or lack of

How do I stop it coming up? Either put in lamba or is there a way round it thanks guys

Codes are above any help please boost in fifth on full theote is going to 3bar!!! Clearly I have an issue with me boost any help would be great

Perhaps the Fabia forum would be a better place?

Air mass sensor could be at fault here 

As above, MAF fault or boost control fault. All the other codes are probably be produced by a single fault.

If you're boosting to 3 bar it'll probably be running weak as a result. The ECU can't compensate for the extra boost, so assumes other sensors are faulty.

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Just realised it was rear o2 sensor.

 

Po172 circuit malfunction bank 1 sensor 2 
System too rich

 

The rear o2 sensor should see a weak mixture as the CAT should have cleaned the emissions up. As you've got a decat, you won't do anything with that fault, unless you refit the cat, or have the rear o2 sensor monitoring removed from the MAP.

 

Po140 -02- sensor circuit

No activity detected bank 1 sensor 2

 

This is weird, with the decat, it should be working just as much as the front sensor. With the cat installed, this sensor hardly moves.

 

Either way, 3bar boost is far too much!

Perhaps the Fabia forum would be a better place?

Why when I've got and octavia vrs!! I HAD a fabia vrs and came across as I said in Introduction...

Anyway:- so how do I fix this is there a way of sorting it out? Can I fit a new lamba with my decat installed?

It's just had a new AFM aswell?

Could the n75 be at fault running that type of boost or a faulty actuator

The cars now gone into limo mode boosting at 7-8psi then when it gets to 4k rpm goes to 1.5bar????? This is very strange but I need it sorting so any help would be appreciated last I need is to be buying a new k04 turbo