P0420 Catalyst system belowq threshold

[Turbo_Oxhoof]

hey guys

Another code keeps coming back.
P0420 Catalyst system belowq threshold Bank 1

what does this mean?
the guy that turbo'ed my car said it's because he turned the fuel down.
i should go away if he richen thing up?

What do guys think??

Ox

[Jesse IL]

Hey buddy, stop posting duplicate threads in every forum about the problems with your car.

[nyoneway]

Could be Maf, O2 sensor, or CAT.

:closed: