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Readings on my 2003 Toyota 4 cylinder ck engine soon is P0128, P0420, P0430.. what could it be. Should I change thermostat, 02 sensor or catalytic converter.. Please advise.

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Check with a scan tool the real value of the temperature. When the engine is warm it should be around 90 degrees. Take it for a spin and watch out for big variations in the temperature.

It the value drops it should be the thermostat.

Posted on May 17, 2011

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I would replace he thermostat, clear the codes and drive it. See if the check engine light comes back on and if it does what codes reappear.

Posted on May 17, 2011

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PO128 = It is probably a bad ECT (engine coolant temp) sensor. PO420= The problem could be a bad cat, o2 sensor (Pre- and/or post cat)or o2 sensor wires, or an air fuel mixture problem that has caused the cat to fail.PO430= Catalyst System Efficiency Below Threshold (Bank 2) Your CAT converter is not cleaning properly. Hope this helps, James Booth

Posted on May 17, 2011

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Definition of Diagnostic Trouble Code P0420 Category: Powertrain Definition: Catalyst System Efficiency Below Threshold Bank 1Note: This definition of P0420 is applied to all manufacturers

Definition of Diagnostic Trouble Code P0430 Category: Powertrain Definition: Catalyst System Efficiency Below Threshold Bank 2Note: This definition of P0430 is applied to all manufacturers

As the code description implies the P0430 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0430 code is combined with other codes, try fixing the other codes first.

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It usually means the catalytic converter is not getting hot enough to function, but could be another issue. The sensor readings between the sensor before and the sensor after the cat are not within spec.
Bank one is the side with cylinder one, or the side with the catalytic converter.

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p0420 and p0430 both indicate a clogged catalytic converter. the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. The p0010 indicates camshaft sensor. The camshaft sensor may be the main problem, as it will affect your timing and fuel/air ratio, which in turn can effect what your Oxygen sensors detect, throwing the p0420 and p0430.

Make sure your car is timed correctly by the timing chain/belt, reset light, then if it dont' solve the problem, change oxygen sensors, if those don't help, catalytic converter is clogged.

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I have a 1996 Ford Taurus GL, and the temperature gauge fluctuates up and down and i replaced the water pump replaced and all that other stuff, and than the check engine light is on and I have disconnected...


P0420 and P0430 are catalytic converter codes indicating that the converter isn't working properly. Temp gauge fluctuating can be caused by a bad thermostat, bad temp sensor, bad wiring harness to the sensor. Also check for air in the cooling system. Read the post below for more information on the catalytic converter issues.

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