P0430 – Catalyst System Efficiency Below Threshold Bank 2
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What Does P0430 Mean?
The function of the catalytic converter is to break down harmful pollutants that are created during the combustion cycle and convert them into harmless gases. Code P0430 indicates that the catalytic converter is not functioning efficiently, therefore increasing the output of harmful pollutants by the vehicle.
Possible symptoms
Engine Light ON (or Service Engine Soon Warning Light
Lack of power from the engine
Decreased fuel economy
The rotten egg or sulfur smell
Note: You will likely not notice any drivability problems, although there may be symptoms such as a rough/hard idle when cold.
What are the Possible Causes..?
A code P0430 may mean The following has happened:
Worn and internally failing catalytic converter
The catalytic converter is no longer functioning properly
An oxygen sensor is not reading (functioning) properly
Also, Read P0171 Toyota Fault Code Problem Solution on Our Other Site
P0430 Diagnosis Tech
Scan your vehicle to verify P0430 is the only code present. If other codes are present, they must be addressed first.
Examine the exhaust system for damage and leaks. Pay close attention to the exhaust manifold, gaskets, and exhaust pipes pre-catalytic converter. If any leaks are found, repair the leak, clear the code, and complete several drive cycles to verify that was the fix.
With the car running and at normal operating temperature, use the digital multimeter to check the voltage reading of the downstream O2 sensor. The downstream O2 sensor produces a relatively steady voltage reading of approximately 0.45V if the catalytic converter is functioning properly. If the voltage of the downstream O2 sensor is constantly jumping between 0.1V and 0.9V, the catalyst is worn and the catalytic converter needs to be replaced.
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