Code p0420, catalytic insufficient?

Hi,

Make sure there are no exhaust leaks before the converter. If there is, fix that first. Next, I attached the diagnostics below for testing. Take a look through them and let me know if you are comfortable performing them.

Also, take a look through this link. It explains how to test it as well. Note there is only one converter on this truck, so that makes it a bit easier.

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Let me know what you find.

Joe

See pics below.

Is there an easy method to find exhaust leak?

Hi,

Usually, you will hear it. Oftentimes when it is near the exhaust manifold or at the manifold, it can sound like a ticking.

When you have the engine running, do you notice anything like that? Also, if you can get your hands on an infrared thermometer, it is easy to check if the temps are off at the converter itself.

To check when the engine is at operating temperature, test the inlet and outlet temperatures of the catalytic converter. The outlet should be a good bit hotter due to the chemical reaction taking place in the converter. The outlet should be between 30°F and 100°F hotter.

Let me know if that is something you cand do.

Take care,

Joe

I'll have to get a infrared thermometer ..
At start up it's a tiny tick but after warm up it's quiet ..
Can driveshaft do it also .or rear bearings ?

Hi,

When you rev the engine, does the tick get louder and speed up with the engine speed?

Often, a leak at the manifold will go away when the engine warms up because the metal expands.

Let me know. Also, if you could record the sound and upload it for me to hear?

Joe