Questions & Answers for: BMW p0420 code

...please help,my car is an astra coupe 04 model you need to have the engine codes pulled and if you have a p0420 code you most likly have a bad cat. but i need to know the code stored in the

...code. Do you have an idea of what I need to do? You should have changed the front o/2 sensors if any. The rears just read what the cats are doing and the fronts control the fuel feeds to the engine. ...

...Catalyst System Efficiency Below Threshold Common Problems That Trigger the P0420 Code Inefficient Catalytic Converter(s)Defective Front or Rear Oxygen Sensor(s)Misfiring engines have a good day

...to buck and surge at one point when trying to accelerate in 3rd gear. the car recently threw P0420 and P1423 trouble codes. I suspect that the catalytic converter may be clogged but have no

code catalyst efficiency fault, the converter is no longer able to do its job and may need replace. Check the attached links very informative, instruction and guides, Good luck "I hope this helped you