Error codes

I attached the testing for the o2 sensor code. I suspect the evap codes are something obvious because you have a gross leak. More then likely a gas cap left off or leaking or you have a cracked line. Have they done any work to the vehicle recently? A lot of times this code is set when a line is left off.

Here is a guide that will help with this:

https://www.2carpros.com/articles/evap-system-code-repair

https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor

Let us know what you find. Thanks

I tested the o2 sensor with multi-meter and it was working. when i was rap up the throttle the reading on multi-meter was raising up and down .
And i have noticed gasoline cap is a little loose. do you think all those three errors will cause by loosening the cap?

I doubt the o2 sensor code was but I would start with one thing and clear the codes to make sure it comes back. in other words you want to fix one thing and then see if that fixes the rest. That means we need to drive it and see if the code comes back.

Well, the codes came back again.

So you tightened the gas cap and all the same codes came back?

If so, we nee do to go through the large leak diag and find the issue. Then do the same thing of clearing the codes and retest. I suspect the leak is caused by the purge valve with those codes but we need to run through it and go from there.

Okay, replaced purge valve and two o2 sensors and going to drive for a couple days and see if the engine light will come on again. I will post the results.
Thanks for the help dude.

Sounds great. We will wait to hear back the positive news.

The engine light just came again tomorrow going to take it again to check for codes again.

The error catalyst bank 2 appeared.

Just a general question. Are you located in the USA? The reason I ask, is the EPA authorized gas stations to use winter blend fuel until it is gone. Winter blend fuel during hot weather can cause catalyst issues.

What was the actual code that you are getting now? Is it a P0420?

Nope outside USA, and the code is p0431.

Okay, so that rules out that issue. However, if this code is active it is either the sensor, or 3 way converter. The fact that you only have the bank 2 code shows it is not air/fuel related. Basically it is something just on that side of the exhaust.

I would swap the o2 sensors side to side and retest. If the issue moves to the other side then you know it is a sensor issue. I attached the process for this if you need it.