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Chrysler 300 P0430 OBD2 Code Diagnosis


This page will help you solve the problems of Chrysler 300 Trouble Code P0430. On the 300, this code is usually caused by a faulty oxygen sensor, but there can be other causes as well. We will see them below. P0430 technically means:

One of the most common trouble codes on all Chrysler vehicles is P0430. This code refers to a number that is given to you when you connect your Chrysler 300 to an OBD2 scanner. No matter what model you have, this OBDII code (1996 and newer models) has the same meaning for all of them.

Chrysler 300 P0430 OBDII Code Defined

Your 300 has at least two oxygen sensors, one before and one after the catalyst. Among the many functions that oxygen sensors have is to measure emissions levels before and after exhaust gases enter the converter. P0430 means that the oxygen sensor downstream catalyst registers an incorrect reading.

P0430 Chrysler 300

The upstream and downstream oxygen sensors should show different readings. The computer wants to see if the catalyst has cleaned the exhaust gases. If the readings from the upstream and downstream oxygen sensors show similar readings, it means that these exhaust gases are not being scrubbed and the vehicle will display the service engine soon light (P0430).

See also: P0420 Chrysler 300

Chrysler 300 Code P0430 Symptoms

Chrysler 300 P0430 Symptoms

There are usually no driving problems associated with P0430. For most people, the first sign that something is wrong is when the check engine light comes on.

These are typical symptoms that something is wrong when you have the P0430 code. Often, when the problem is just the oxygen sensor, you won’t feel any symptoms.

  • Mileage- It may or may not suffer depending on whether the catalyst is clogged or not.
  • Power loss– It is a really strange feeling to drive a vehicle with a catalytic converter that is going out. Normally, the engine runs well at idle and with a light load. When the engine is put under heavy load, it feels like it is running out of gas. It is very similar to the symptoms of a bad fuel filter.
  • service engine light– This is often the only symptom of Chrysler 300 code P0430.

Related: P0442 Chrysler 300

Main Causes of P0430 on the Chrysler 300

OBD2 code P0430 Chrysler 300

There are many things that can cause the P0430 fault code on your 300. Here are the most common ones.

  • Oxygen sensor– The P0430 code is thrown when the oxygen sensors on both sides of the exhaust have very similar readings. When the oxygen sensor is bad, it can cause a false reading and trigger the code. If the engine does not show any of the performance decreases associated with a bad catalyst, it is very likely the oxygen sensor (if you haven’t already noticed the loss of performance).
  • Catalyst– The catalyst is responsible for eliminating all possible contamination from the 300’s exhaust. Over time, they can become clogged. Although modern catalytic converters are supposed to last the life of most vehicles, there may be some underlying problem if it has become clogged. Here’s how to diagnose a bad catalyst from Advanced Auto Parts.
  • O2 sensor Cabling– Over time, the oxygen sensor wiring can become damaged. It is especially volatile since it is right next to the hot exhaust at all times. The downstream oxygen sensor wiring is especially volatile since it is so far from the ECM (more distance to travel.
  • Timing– If your 300 has a misfire or the exhaust gas timing is incorrect, this can affect the gases going to the O2 sensors enough for the P0430 code to register.
  • Exhaust Drain– If there is a noticeable exhaust leak coming from the vehicle, it may change what the O2 sensors register enough to throw the P0430 code.
  • Engine temperature sensor– If the computer does not know what the engine temperature is, it will keep the fuel mixture rich. When the fuel mixture is rich, the exhaust seen by the O2 sensors will be out of range and could trigger P0430.

Chrysler 300 P0430 Code Possible Solutions

Often the oxygen sensor is the cause of P0430. Specifically, it is usually the O2 sensor or sensors located on the underside of the catalyst.

But don’t be surprised if it doesn’t. It would be a good idea to check the exhaust for leaks first. You should be able to easily hear an exhaust leak underneath the vehicle.

Unless you have an exhaust leak, you’ll probably need to check the O2 sensors and/or catalysts. Here are a couple of good guides to help you do it.

Good luck figuring out the cause of P0430 on your Chrysler 300. If there are any inaccuracies, or anything you think could improve the article, feel free to comment or message it. Thank you.


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