1.8t AUQ help needed

[octaviatdi02]

Hello everyone i have a very frustrating problem with mk1 vrs octavia 1.8t auq it keeps bringing on the p0420 code i have looked at the live data and the lamda controller reafing is going up and down lile a yo yo its reading -17% then goes up to -8% and if i hold a slight bit of throttle on it will sit at 0.00% the car is mapped and no cat any way to solve this handy than getting it mapped out has anyone got a catalytic converter forsale

[iXtremist]

Only proper way how to solve it is get it mapped out.

[octaviatdi02]

2 hours ago, iXtremist said:

Only proper way how to solve it is get it mapped out.

2 hours ago, iXtremist said:

Only proper way how to solve it is get it mapped out.

Could you tell me how much roughly would that be to get done or will it be better to fit a cat

4 hours ago, octaviatdi02 said:

Hello everyone i have a very frustrating problem with mk1 vrs octavia 1.8t auq it keeps bringing on the p0420 code i have looked at the live data and the lamda controller reafing is going up and down lile a yo yo its reading -17% then goes up to -8% and if i hold a slight bit of throttle on it will sit at 0.00% the car is mapped and no cat any way to solve this handy than getting it mapped out has anyone got a catalytic converter forsale

 

[xman]

You'll need a cat anyway as its illegal to drive on a public highway without one and an MOT automatic fail if its missing.

 

https://www.mot-testing.service.gov.uk/documents/manuals/class3457/Section-8-Nuisance.html#section_8.2

[iXtremist]

There is always a way to MOT heavy upgraded car, even in CZ where we cannot fit even bigger brakes oh lowering springs..
Cost is approx 200 libras here in cz.