Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.
Register

Rotten egg smell… not sure it’s the AC.

AZAV8R

Member
Aug 29, 2020
131
109
Arizona
Having already done 2 cabin air filter swaps, I am well familiar with the funky smell that a moldy evaporator can cause. I had a weird experience today. I’d left HAL parked with camp mode set to 60f. (I had take- home restaurant food and needed to make a 30 minute stop.) At the time, the OAT was about 110f in Tucson. When I opened the door to get in, the smell of rotten eggs about put me on my knees. It was REALLY NASTY!! My first thought was a failing 12v battery, but I replaced it back in April with an Ohmmu. To my knowledge, lithium batteries do not smell like that when they fail (they just cause nasty fires!! 🤪). No warnings or messages. The smell dissipated quickly and did not return on that trip. I will go out tomorrow am to see if happens again.

2020 M3LR.

I’m pretty sure I have a decent handle about how my car works, but this stumps me. Feedback from some knowledgeable folks here will be appreciated!

😎😎
 
Last edited:

Tam

Well-Known Member
Nov 25, 2012
9,470
8,625
Visalia, CA
Thanks. Anyone out there know more info on the upgrade?
Maybe I didn't remember that correctly: it could be that there was no new air duct redesign: just plain maintenance of cleaning the area and switching the filters yearly or every few months.
 
  • Like
Reactions: AZAV8R

Frank99

April 2018 Model 3 LR RWD, EAP, FSD
Apr 7, 2016
350
471
Arizona
I haven’t heard of a strong rotten egg smell that wasn’t related to either a lead acid battery, Yellowstone, or a rotten egg. I’ve got no help for you other than suggesting looking under the seat to see if an egg got loose the last time you went shopping.
 

RayK

Active Member
Apr 5, 2016
2,222
2,219
San Jose, CA
It was.... "Spleen"!

1630228062084.png


Other than that, my initial response would have been your (OEM) 12V battery but I see you've replaced it with an Ohmmu. Natural gas, the municipal energy source, can also smell like rotten eggs, as well as drinking water in some rare cases. Or something crawled into your car and died.
 
  • Like
Reactions: AZAV8R and hcdavis3

Frank99

April 2018 Model 3 LR RWD, EAP, FSD
Apr 7, 2016
350
471
Arizona
One last thought-perhaps you were parked over a manhole cover leading to the sewer. This time of year there can be some pretty rank air around them.
 

dduffey

Member
Aug 26, 2015
367
297
Austin, TX
Having already done 2 cabin air filter swaps, I am well familiar with the funky smell that a moldy evaporator can cause. I had a weird experience today. I’d left HAL parked with camp mode set to 60f. (I had take- home restaurant food and needed to make a 30 minute stop.) At the time, the OAT was about 110f in Tucson. When I opened the door to get in, the smell of rotten eggs about put me on my knees. It was REALLY NASTY!! My first thought was a failing 12v battery, but I replaced it back in April with an Ohmmu. To my knowledge, lithium batteries do not smell like that when they fail (they just cause nasty fires!! 🤪). No warnings or messages. The smell dissipated quickly and did not return on that trip. I will go out tomorrow am to see if happens again.

2020 M3LR.

I’m pretty sure I have a decent handle about how my car works, but this stumps me. Feedback from some knowledgeable folks here will be appreciated!

😎😎

You already addressed this, but I woke up one day with the garage smelling like rotten eggs due to 2018 M3 12v battery failed (no warnings). It was dead enough that the car didn't turn on / HV connecter would not click, but just enough power that it would not let me pop the hood w/ the tow hook wires.
 

rrolsbe

Member
Feb 18, 2017
245
135
Albuquerque
You already addressed this, but I woke up one day with the garage smelling like rotten eggs due to 2018 M3 12v battery failed (no warnings). It was dead enough that the car didn't turn on / HV connecter would not click, but just enough power that it would not let me pop the hood w/ the tow hook wires.
So did you just wait for the 12V battery to deplete some more and then open the frunk via the tow hook wires?
 

dduffey

Member
Aug 26, 2015
367
297
Austin, TX
So did you just wait for the 12V battery to deplete some more and then open the frunk via the tow hook wires?

In my case after it sat for some time and tried again the HV came on and I was able to back out and pop the hood. I left my hood unlatched for mobile service to replace the battery.

Before the HV was working things would half work like the door would unlock but window would struggle to lower when the door opened.
 

Dr_Arthur

Member
Jul 31, 2020
13
6
Australia
Having already done 2 cabin air filter swaps, I am well familiar with the funky smell that a moldy evaporator can cause. I had a weird experience today. I’d left HAL parked with camp mode set to 60f. (I had take- home restaurant food and needed to make a 30 minute stop.) At the time, the OAT was about 110f in Tucson. When I opened the door to get in, the smell of rotten eggs about put me on my knees. It was REALLY NASTY!! My first thought was a failing 12v battery, but I replaced it back in April with an Ohmmu. To my knowledge, lithium batteries do not smell like that when they fail (they just cause nasty fires!! 🤪). No warnings or messages. The smell dissipated quickly and did not return on that trip. I will go out tomorrow am to see if happens again.

2020 M3LR.

I’m pretty sure I have a decent handle about how my car works, but this stumps me. Feedback from some knowledgeable folks here will be appreciated!

😎😎
Hydrogen sulphide can be coming from the 12v battery. The gas is toxic in high concentrations. Change the battery.
 
  • Disagree
Reactions: Rocky_H

Products we're discussing on TMC...

About Us

Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.

Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


SUPPORT TMC
Top