Here's a link to your code. Trouble Code P0420 Catalyst System Efficiency Below Threshold Bank 1 IF YOUR OIL NEEDS CHANGING, TAKE TO DEALER AND LET THEM CHANGE,THEY WILL FIND PROBLEM CODE AND TELL YOU WHAT'S WRONG AND HOW MUCH TO FIX,THEN IF YOU THINK YOU CAN DO IT,THEN YOU WILL FIND OUT WHAT'S WRONG FOR FREE AND NOT REPLACE PARTS TO SEE IF THAT'S IT,THIS IS WHAT I DO WITH MY TOYOTA THERE SCAN TOOL PIN POINTS THE PROBLEM.
Trouble Code P0420 Catalyst System Efficiency Below...
Detailed information on the P0420...
Hi Osar-
I pulled this link from ODB-codes.com. It lists the possible causes, diagnostics and resolution for engine code issues. Hope this helps!
P0420 OBD II Trouble Code
SOURCE: Mazda mpv O2 sensor wires?
Put some penetrating oil on them and let it soak overnight. This will break up the rust and other build up. Make sure that it is penetrating oil, you can get it at any automotive store.
SOURCE: O2 sensor
There should be two O2 sensors. If you look inbetween the engine and radiator following the exhaust manifold down to the exhaust pipe you should run into the 1st O2 sensor, following the pipe down stream under the vehical towards the catalytic converter you should find the second O2 sensor. The 1st O2 should be easy but the 2nd might be difficult depending on your abilities. Coils will depend on 4 or 6 cyls, 1 for each cyl. Repair man, go to, pep boys, napa, auto zone, advanced auto parts to name a few.
SOURCE: Fault code P0133 can't pass inspection.
This code does not always mean the O2 sensor is low, but if u want to replace it here is the info to do that and the part number.
The sensor you want is the one in the exhaust pipe of the engine cylinder bank that has #1 cylinder in it, as you face the engine with the hood open the cylinder bank u want is the rear bank, u will need to jack the car up and get under it to remove the sensor, u may also need a special socket to remove it, the sensor is the one that is before the catalytic converter. part number is:DENSO Part # 2344068
REAR; Before Catalyst
SOURCE: i need a wiring diagram for an o2 sensor on a
See page two on this PDF file HERE
http://www.taligentx.com/passat/info/scheduledmaintenance/Bosch-Universal-Oxygen-Sensor-Installation.pdf
SOURCE: I have my check engine
bank 2 is the bank that doesn`t have cylinder #1 in it.sensor 2 is the sensor after the catalytic or at the rear of the catalytic converter.with mazda use a good quality sensor(preferedly factory) as if its poor quality sensor it will set a code and cause problems.you also usually have to cut and splice the wires to the original plug to use them.try buying one from a parts store that you don`t have to cut and splice that way it theres a problem with the sensor you can get it replaced easier.
Testimonial: "awesome, but still a bit confused.lol. thanx and sorry.lol."
has an oxygen sensor in front and behind it. When the
vehicle is warm and running in closed loop mode, the upstream oxygen sensor
waveform reading should fluctuate. The downstream O2 sensor reading should be
fairly steady. Typically the P0420 code triggers the Check
Engine Light if the readings of the two sensors are similar. This is indicative
of (among other things) a converter that is not working as efficiently as it
should be (according to specs). It is part of the vehicle emissions system.
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