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P0430 Fault Code

You can find information about the P0430 fault code on this page.

It is one of the most popular fault codes that people search for on this website (in the top 50).

We have given it a seriousness of 7/10 with 1 being the least serious and 10 being the worst.

P0430 Short Description

"Catalyst System Efficiency Below Threshold (Bank 2)"

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Description Icon Long Description

The P0430 is the fault code representing an issue with the catalyst system. This code is logged when the ECU detects the catalytic converter performing below a set specification in bank 2.

The catalytic converter is used to break down the pollutants after the combustion process. They are always found somewhere in the exhaust system as they are designed to catch pollutants in the exhaust fumes.

Issues with the catalytic converter can typically be a result of poor engine operation or faults in the exhaust line between the engine and the catalytic converter.

Bank 2 is found on the side of the engine opposite to cylinder 1. For the same issue in the first bank, the fault code is P0420.

Only vehicles with a catalytic converter are susceptible to this error. While not all older vehicles have this system, they are now a mandatory system almost globally. Some of the most problematic catalytic converters are found in Ford, Hyundai, Mazda, and various other models.

Warnings Icon Other Signs of This Problem

There are only a few signs that could help determine a P0430 error code. The most notable is the Check Engine light being on.

There could be a slightly rougher idling and reduced power output from your vehicle. In some circumstances, there could be smoke coming from the exhaust pipes.

It can also be logged along with codes that represent issues with misfires or oxygen sensors. These are typically codes like P0300, through to P0308 depending on the number of cylinders in the engine. Fault P0171 and other similar issues can also show.

Broken Down Icon What Could Be The Problem?

The most obvious cause for the poor catalytic converter performance is a fault within the component itself.

Other issues can come from faults in the operation of the engine itself, as well as mechanical damage in the exhaust system that creates a leak in exhaust fumes before the catalytic converter.

Faulty oxygen sensors can also give off a bad reading which can trigger this code.

Fixed Icon Fixes

There are several ways to go about fixing the various issues that could cause fault code P0430 or its mirror P0420.

If there are any fault codes representing issues that could occur before the catalytic converter, be sure to fix these first as they could help or completely solve this issue. These can be things like a faulty fuel injector, vacuum leaks, or any other mechanical damage in the engine itself.

In the case of a faulty catalytic converter, it is possible and likely the easiest to simply replace the part entirely.

Another solution is to replace a faulty oxygen sensor. This can give a false reading of emissions, which would trigger this fault code

Be sure to look out for any leaks in the exhaust manifold before the catalytic converter.

Danger Icon Seriousness

Depending on the severity of the cause for fault code P0430, there can be moderate risk involved with it.

Left unchecked, there can be damage done to various components in your vehicle. Catalytic converters are usually expensive, so it should be a priority to avoid further damage. You can also be liable for emissions fines.

P0430 Image

Commonly Affects

Error Icon P0010

Intake Camshaft Position Actuator Circuit / Open (Bank 1)

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Error Icon P0011

Intake Camshaft Position Timing - Over-Advanced (Bank 1)

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Error Icon P0012

Intake Camshaft Position Timing - Over-Retarded (Bank 1)

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Error Icon P0013

Exhaust Camshaft Position Actuator Circuit / Open (Bank 1)

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Error Icon P0014

Exhaust Camshaft Position Timing - Over-Advanced (Bank 1)

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Error Icon P0016

Crankshaft Position Camshaft Position Correlation Bank 1 Sensor A

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