Code P2227, Barometric pressure sensor causing stalling at idle?

Hi,

They hid this one. The barometric pressure sensor isn't serviceable. It is integral to the powertrain control module (PCM). For vehicles without a BARO sensor and with a MAP sensor, the BARO value is inferred by the PCM based on the MAP value under certain operating conditions.

Is this the only code that is present? If so, take a look through the diagnostics I included below. Let me know if you are comfortable performing them. They do require a scan tool that can communicate with the PCM.

Let me know.

Joe

See pics below.

Hi,

I didn't realize you had a catalytic converter code. I thought the P2227 was the code causing a problem. If you have resolved that issue, that is good news.

As far as the P0420, that indicates the catalytic converter is operating below threshold. In most cases, the converter needs to be replaced. To check it, you can use an infrared thermometer to see if it is functioning.

With the engine running and at operating temperature, check the inlet temp of the converter. Then, check the outlet temp. The outlet temperature should be hotter. If it isn't, then the oxygen sensors can't do their job which is likely causing an air fuel mixture issue. Here are two links, one explains the result of a faulty converter, and the other link explains how to test one:

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

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

Let me know if that helps or if you have other questions.

Take care,

Joe

What did you place on the oxygen sensor? If you used a plug saver; did you drill the hole larger at the end of it? What new codes are you getting since this was done?

The idea that the sensor isn't fully inserted into the exhaust may be causing the P0420.

Let me know as much as you can. Also, if there are other codes, let me know them as well.

Take care,

Joe

Hi,

It may just be bad. Try checking the temperature at the inlet and outlet to see if the outlet is hotter. It should be.

Let me know.

Joe

Hi,

It sounds like it may be partially plugged. The temperature should be the same with a faulty converter and hotter at the outlet if it is working.

In addition to the stalling at times, have you noticed a power loss? I would remove the upstream oxygen sensor and see if the stalling stops. If the converter is clogged, that could be causing issues with the MAP sensor due to excessive back pressure.

Let me know.

Joe

Hi,

If there is a leak downstream from the sensor, that won't affect it. However, if there is a leak before either of the oxygen sensor, that certainly can cause an air/fuel mixture issue.

If the temperature at the end of the converter (outlet) is half as hot as where it enters, something is wrong with the converter. I'm questioning if it could be partially clogged.

Let me know.

Joe