Thank you so much for the answers. The first buzz in the morning happens when i depress brake for shifting in gear.

This might also confirms one thing: there is leak in the intake path. I still not identified location yet. Still getting P0101 code.

Really appreciate your help.

Hello, could someone kindly help me identify the round aluminum look part in the center of the photo?

Also, when starting cold, this thing will buzz. Is it normal?

Thank you.

Great. I will check this out. A lot of home work

Thank you so much.

Captured these bad stft cases. It seems the ecm decided to hold stft. The car is cold. One thing i should mention is when start, engine did not idle at high speed as it normally does. Noticed this several times, each time, ECM is likely to set 0101 code. BTW, when STFT started moving, check engine l...

Car has been running good for the past two days. Code is still there but check engine light is off. When it runs good, all things look good. For this kind of intermittent fault, is it more a electrical (sensor) or mechanical (leak) problem? I will try to find a way to log the car info to capture to ...

Thanks, draser.

I will try to capture one later when i go out. When the car idle smooth, the MAF reading is about 3.5g/s, give or take. But when idle become rough, the reading could be between 1.x to 5.x. I've seen STFT to reach positive 25 and/or negative 25.

Hi, thanks for coming in. From following data when code us triggered, is the problem with the MAF sensor or leak in the air intake path? Freeze frame information: ------------------ Fuel Status = 0 byte Engine Load = 22.745 % Engine Coolant Temperature = 190.4 °F Fuel Trim Bank 1 Short Term = -13.28...

Did you check possible leak from maf to intake? Many people mentioned this when dealing with this code.

Thanks for the reply.

Most time, my car report rich mix, but those elevated readings made me confused. I will check plugs since the car tends to stall when put in gear when engine is cold.

Thanks for the interesting material.

I am trying to make sense of a lambda reading as attached. Any comments? This happens only when car is in gear, rolling.