P0430 indicates that the oxygen sensor downstream of the catalytic converter has detected a performance issue, meaning that the neutralisation component on cylinder bank 2 isn’t breaking down harmful pollutants efficiently. This error could be related to ignition problems, the fuel system or sensor malfunctions.
Common causes of the P0430 codeIt means that the catalytic converter on cylinder bank 2 is not working efficiently. In short, it indicates that the component isn’t converting enough exhaust gas into steam.
The root cause is often a lean or rich fuel mixture caused by faults in the ignition system, fuel supply problems or air leaks. However, it can also be the result of a sensor malfunction, blockages, or using incompatible fuel. It may also appear due to ageing. The converter is usually expected to last up to 10 years or 100,000 miles.
It is better to refrain from driving until the unit has been repaired as it could cause the component to stop working altogether and fragments of broken parts could get into the combustion chambers, causing extensive damage. Replacements aren’t cheap, but without this component, the vehicle will release a dangerous amount of toxic fumes.
Fault code P0430 - Catalyst System Efficiency Below Threshold (Bank 2) can occur with any car but is most often found on the following cars:
If you get the code P0430 on your car, make sure that the diagnostics are carried out correctly and the error is still relevant. Check for symptoms associated with the problem and explore options for resolving it.
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