Questions & Answers for: Mazda p0420

...I HAVE A 2000 MAZDA MIATA AND IT IS BRINGING UP A CODE PO421, CAN YOU TELL ME WHAT THAT IS The P0420 code is a more common one in general. The description for P0420 is Catalyst System Efficiency ...

...light I posted my problem yesterday and was told to repost the code when I got it and here it is P0420 can you please tell me if this code has anything t9o do with the catalytic converter? I have ...

check engine light 1998 Mazda Millenia I got a response from the code that I sent, P0420 which is Catalyst System Efficiency Below Threshold Bank one but what is the main cause,oxygen sensor? I have ...

...po420 on scan tool but o2 sensor was replace 2 months ago code po420 Hello and welcome. the code P0420 is for a bad cat. converter. replacing 02 sensors wont repair this code. the code simply's ...

check engine light stays on after the car has had two catalytic converter flushes Cat Converter flushes??? I think you got your wallet flushed. , if the code is p0420, you need a new converter.

i got a diagnostic test and came up code p0420. what should i do to fix the code for it to pass ommissions test? Replace the 02 sensor bank 1. Although there was a service bulletin for your year car. ...

p0420 p0171 From last one year i had p0420 code , its came when i got water in spark plugs and my car got some miss fires , after few days that code came . now one day i saw that my car's air ...

which o2 sensor to change for codes p0420 in 2005 mazda 3 where the catalyst is missing No cat this must be a middle east model then ,they have no cats or O2 sensors P0420 Catalytic Converter System ...

P0420 I have code P0420. I connected a scanner to check o2 sensors and front and rear have similar readings. O2 sensors are ok? I need to change catalityc? What another things could check to solve the

I have a 98 Mazda 626, error codes p0420 and p0505, anything that could cause both? No problems with the car just need to get the car to pass emmissions so need the check engine light off. It does ...