P0420 Fault Code

[C3PO]

The above description states Catalyst Efficiency below Threshold (Bank) 1

 

Can anyone explain  what that means in English?

 

My car is C3 1.4 petrol late 52 plate Apart from the MIL light being on the car runs fine.

 

I have used a AUTEL CAN OBD11 scan tool & erased the fault code for now.

[coastline taxis]

Sounds like your cat is on its way out. couple of things to check first before you buy one

 

1   check for exhaust leaks/damge to manifolds

2   damaged oxygen sensors  both of them

3   engine temperature sensor working ok

4   engine isnt misfiring/burning oil/fuel leak.

 

if all the above are ok then its the cat

[C3PO]

Thanx for that will check out those items.

 

Just returned from 280m round trip, apart from the Mil light coming on abt midway the car ran fine.

 

The eng temp remained on 3 bars, fuel economy abt 40+ with no loss of performance so far. :)