Technical P0420 error, lambda graph inside

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Technical P0420 error, lambda graph inside

Razon

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My car goes into limp mode randomly, doesn't matter the speed, happens every 50km or so, does this for 1-2 minutes, it will not respond to the gas pedal and slow down, then it continues normally like nothing happened.

This is after starting the car:
pU5kCHa.png


Later (revved the car at 92 seconds in)
5Jngv5R.png


And here's the error code:
47U4KmF.png
 
Hi, I have same sort of graphs and same fault code. However, my car doesn't go into limp mode so I don't know why yours keeps doing that.
The problem shown on the graphs is down to the efficiency of the catalytic converter being off which means the cat's at the end of it's life or there's something happened around that area, like an exhaust leak maybe. I've not had chance to look into my problem yet though unfortunately.
And, like I say, I don't see why your car goes into limp mode. I suspect that's down to another problem :(
 
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