P0420 no power

[Murph1005]

Thought it was my turbo gone but Iv plugged it in and come back with catylic system efficiency below threshold (Bank 1) the car has hardly any power at all and abit of blue smoke comes from under bonnet and out exhaust any ideas?

[F0CUE]

What are the Possible Causes of the P0420 Code?

A faulty catalytic converter is the most frequent cause of  a P0420 trouble code. Issues that can cause this OBD-II code include:

A failed catalytic converter (very common)

A faulty oxygen sensor (not very common)

Circuit problems, such as damaged wiring and loose connections (not very common)

An exhaust leak (not very common)

Computer issues (e.g., software in need of an update) (not very common).

[TomsFocus]

Remember that fault code is reliant on both lambda sensors getting full & 'clean' exhaust flow. 

If you've got exhaust coming out of the front, that could be throwing the readings off.  We really need to know where that's coming from.

If you're genuinely getting blue smoke from burning oil, the cat may now have been ruined by oil through it anyway.

Need a bit more information to advise any further.  Which engine is it for a start lol?  

[Murph1005]

It’s a 1.0 ecoboost the smoke comes from under the heatshield by the turbo don’t really have much info the power was coming and going on the motorway before it fully went

[TomsFocus]

23 minutes ago, Murph1005 said:

It’s a 1.0 ecoboost the smoke comes from under the heatshield by the turbo don’t really have much info the power was coming and going on the motorway before it fully went

Have you got tools to remove the heat shield for a closer look?

If not, I think it'll be best taken to a garage for diagnosis.  I wouldn't change the cat or lambda until we know what's up with the turbo.

[Murph1005]

Would the turbo cause that code? Il try getting the heat shield off for a better look

[JW1982]

Being a 1.0 ECOboost and based on the symptoms there is a 99% chance that the catalytic converter is blocked. This causes the DTC code and lack of performance.

As a result of the blocked catalytic converter the exhaust gasses will build up excessive pressure. As a result of the excessive pressure the gasses can leak through the wastgate arm. This is completely normal behaviour since the wastgate arm does not have any seals.

IT is highly recommended to install a new original catalytic converter. Aftermarket ones contain less prescious metals that are needed for the catalyst process. As a result of this aftermarket catalytic converters have low life expectency. In fact on a 1.0 ECOboost aftermarket catalytic converters usually last very short.