[David Erhahon]

OK.
So I finally realized that there is a breather chamber and breather tube which link the the crankcase and the air intake hose/tube; on the 2.4L engine.

I bet this explains it.

Thanks for all the help, Richard.

[David Erhahon]

In another forum, people say such crankcase high vacuum is normal in Honda cars.
Nevertheless, I will perform the compression test when I get the tool.

[David Erhahon]

Would have done that (autozone) if I were in the US.

Thanks for the advice though. Well received.
I will try to purchase one locally.

[David Erhahon]

Checked PCV valve today. It seems fine. It’s not clogged. I cleaned it anyway. Hose was not clogged also. There’s vacuum with engine on. No oil in the house. Very little oil is present in the PCV valve itself.

I will need to take it out for a compression test as I don’t have the tools for that.

Thanks again.

[David Erhahon]

OK.
Thanks.

I’ll do that tomorrow and give feedback.

[David Erhahon]

Yes, I would expect so.
Nice idea rebooting the computer.

Ok

[David Erhahon]

On my 05 accord, the heater monitor sets even while idling. I don’t have to drive anywhere. It should be among the first things to set.
Most such O2 heater issues are usually due to electrical problems. Either faulty wiring or faulty heater in the sensor.

You will need a multimeter and your Hyundai wiring diagram to check it.

[Author]

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