Tip & How-To about 2003 Chrysler 300M

I get OBD codes P0420 and P0430


P0420 and P0430

P0420 means Catalyst System Efficiency Below Threshold, Bank 1

P0430 means Catalyst System Efficiency Below Threshold, Bank 2

It means that the O2 sensors are good, and the O2 sensors are telling you that your catalytic converter, in the exhaust system is not working fine, as its emissions are polluting the air too much.

The catalytic converter is part of the exhaust system. The way to test this part is by doing an emission test. The two OBD codes that you are getting are already a test telling you that the converter must be replaced, unless an emission test done at a garage says the opposite.

This kind of problem will trigger the check engine light, and your car will also waste too much fuel.
You also risk to get in trouble if the car goes through an Air Pollution control, as the car won't pass an emission test in this condition.

To conclude, the Catalyst System must be replaced, the O2 Sensors are fine.

This is a repair that should be done at a garage, however you can find DIY instructions here:How to Replace a Catalytic Converter or you can get more detailed instructions, and step by step illustrated procedure purchasing a repair manual.

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Sir,help me I have 2004 Toyota sienna van XLE ..my engine light was . c1201 ,c1223, c1224, u0123 u0124 u0126 P0430 P0420 Thanks Mr felix


c1223 Malfunction in ABS control system
c1201 Brake Boost Sensor Circuit Range/Performance
c1224 Open or short circuit in NE signal circuit
u0123 Lost Communication With Yaw Rate Sensor Module
u0124 Lost Communication With Lateral Acceleration Sensor Module
u0126 Lost Communication With Steering Angle Sensor Module
p0430 Catalyst System Efficiency Below Threshold Bank 2
p0420 Catalyst System Efficiency Below Threshold Bank 1

you have major problems is it worth fixing???,its gonna be quite a bit

Jun 02, 2015 | Toyota Cars & Trucks

1 Answer

1996 taurus p420 code


The P0420 means Catalyst System Efficiency Below Threshold (Bank 1), and the P0430 means Catalyst System Efficiency Below Threshold (Bank 2).
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ECU unlock immobilizer tool

Sep 17, 2012 | 1996 Ford Taurus

1 Answer

what do these codes mean ? po430 po420 po306 for mercury cougar 1999


P0430 code is(catalyst efficiency below threshold on bank 2)
P0420 code is((catalyst efficiency below threshold on bank 1)
P0306 code is(cylinder 6 misfire detected)

Dec 13, 2011 | 1999 Mercury Cougar

2 Answers

Hi on my nissan primera 2002 1.8 i have pluget in launch and the error is PO430 would you discribe what das it mean? Regards Adam


P0420 TW (Two-Way) Catalyst System, Bank 1
P0430 TW Catalyst System, Bank 2 .
most likely a new catalytic converter.

Thanks. keep updated for any more query.you can rate this solution and show your appreciation.

Sep 28, 2010 | Nissan Pulsar Cars & Trucks

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