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Code P4120, recently popped up?

Tiny
SARAH CONNER
  • MEMBER
  • 2010 LEXUS RX 450H
  • 4WD
  • AUTOMATIC
  • 239,000 MILES
I have this code that popped up recently after my car was repossessed and towed. I'm not sure if the problem could possibly be caused by being towed improperly as tow company seemed a little sketchy and their practices a little questionable. I would like to know if it is possible and will need information to add to a claim I'm trying to make against the company as my alignment is way off and I had a wheel alignment a month before it was towed.
I'd appreciate any feedback on this. Thank you
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Saturday, November 9th, 2024 AT 2:10 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

I need you to double-check the code you provided, P4120. It isn't listed in any of my service manuals. I even checked online and wasn't able to find it.

Let me know.

Joe
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Saturday, November 9th, 2024 AT 4:56 PM
Tiny
SARAH CONNER
  • MEMBER
  • 2 POSTS
Sorry I mixed up the numbers.
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Saturday, November 9th, 2024 AT 8:22 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

The small size of the leak makes it difficult to locate. The best thing to do in this situation is to have the EVAP system smoke tested. Basically, smoke is injected into the emissions system. Where the leak is located, the smoke will be seen.

I attached a picture below and circled the canister. It is under the vehicle and requires the rear engine cover and center and the front center floor cover to access. If you remove those things, you could check to see if anything is damaged or disconnected. Often, the canister itself may develop a crack, or one of the vacuum hoses will crack and leak.

Let me know if this helps.

Take care,

Joe

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Sunday, November 10th, 2024 AT 7:07 PM

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