Hello My Fellow Honda Accord Enthusiast, I have one important question if you can please answer, I have Honda Accord 2014 Sports, I have engine light on when i go for high rpm and suddenly rpm gets dropped and car struggles. So i cleaned Throttle body its pretty dirty after 125,000 miles. i have cleaned the engine bay with gunk engine degreaser with safety precaution like covering alternator, removed battery, air intake covered. when i am done started the engine it came back on but after few seconds a white smoke came from the Air-Fuel Oxygen Sensor location (NOT from the Exhaust) what should have happed ? i thought i give enough time to let engine dry, On second day i sun bath the engine again.

After Third day of sun bath I have started the engine second time still the white smoke came from the location of the Air-Fuel Ratio Sensor (NOT from the Exhaust), i think it might be water vapor cause it has no smell of burning anything. At last i have ordered new air-fuel sensor with OBD 2 scan tool, i will update the codes when get the OBD 2. Please Help me out figuring out what cause the white smoke?

 

That area is the exhaust manifold that holds the A/F sensor. That manifold gets very hot when the engine is running. You can either have something burning off when the engine warms up or a leak from the manifold or sensor. I'd unplug the electrical connector for the O2 sensor, remove that metal cover, plug in the sensor. Start the engine and identify where you have a leak. A crack in that manifold, or a problem with the exhaust manifold seal at the cylinder head, or maybe exhaust is leaking through the A/F sensor are items to look for.

 

@PAhonda Thank you for your valuable feedback, today i received the OBD2 but no codes were shown i guess because i unplugged the battery for cleaning. I have also unplugged the O2 sensor its very rusty and one black ring formed on the sensor. Tomorrow morning i will do what you said, my guess is that exhaust is leaking from the O2 sensor location because of the cleaning maybe and lose connection of sensor.

 

@PAhonda I am sorry i don't know how to upload a video in this forum but i have upload it on google drive, please watch it and tell me what is happening ?


https://drive.google.com/file/d/1Y-w...ew?usp=sharing

My Guess is either smoke is coming from bad sensor itself (because i cleaned the engine bay with Gunk engine degreaser ) or the connection is lose or engine is burning something.

Thank you again for helping me.

 

I can't tell the location of the leak from the video.

Let the manifold cool down. Grab a spray bottle of soapy water and spray that whole top of the catalytic converter/exhaust manifold and also where it bolts to the engine block (where those 4 nuts remain. I'd use about 2:1 water:dish soap, so about 2 cups water 1 cup dish soap.

Start the car and see where you get bubbles to pinpoint the leak.

 

parth8vgft;400356]@PAhonda have you gotten this fixed I have the same problem sadly

 

It went away after some time, so i moved with the life. I suspect is either the water trapped and burning from Engine Bay Cleaning OR the leak is coming from catalytic converter where it bolts to the engine block.