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$7E8, 7E9 and loose gas cap lights?

Tiny
MAZDACANYON
  • MEMBER
  • 2017 MAZDA CX7
  • 2.5L
  • 4 CYL
  • 4WD
  • MANUAL
  • 45,000 MILES
Title summarizes errors. Attempts at fixing include replacing the gas cap and air filter. Thanks for any help!
Friday, June 16th, 2023 AT 3:00 PM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
The "loose gas cap" light is a separate warning related to the evaporative emissions system. It's designed to alert you if the gas cap is not properly tightened or if there is a leak in the system.
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Friday, June 16th, 2023 AT 3:07 PM
Tiny
MAZDACANYON
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  • 4 POSTS
Thank you, Ken. I will have a chance to run the reader again this weekend and hope for more data. My gas cap placement has been impeccable since this started, clean connections and audible clicks. :-) Never have I thought more about closing a gas cap!
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Friday, June 16th, 2023 AT 3:12 PM
Tiny
KEN L
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Yep, the system needs to be sealed to work correctly. :) Have a good weekend.
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Saturday, June 17th, 2023 AT 9:45 AM
Tiny
MAZDACANYON
  • MEMBER
  • 4 POSTS
Well, I took it to a professional and I have a "cracked canister, " a $355. Part. Now hoping the "b-b like pellets" inside haven't been sucked into the system. (Code reader leaves the mechanic feeling optimistic.) I wish this made sense to me, but the difference between working on a 2017 Mazda and a 1972 VW van is making me feel old.
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Wednesday, July 5th, 2023 AT 1:26 PM
Tiny
KEN L
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Yep, it happens, here is how the canister is replaced in case you want to do the job, thanks for letting us know what was wrong. Check out the images (below). Please let us know what happens.
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+1
Thursday, July 6th, 2023 AT 9:56 AM
Tiny
MAZDACANYON
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Thanks so much. I'll let the pros earn their $120 and get it done in an hour! While learning about this, could you point me to a primer on how this system works? BBs in the canister!
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Thursday, July 6th, 2023 AT 11:39 AM
Tiny
KEN L
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Sure, here is how the EVAP system works and illustrations to help with the explanation. Use 2CarPros anytime, we are here to help. Please tell a friend.
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Friday, July 7th, 2023 AT 9:46 AM

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