# Could a failed (leaking) oil pressure sensor cause a po455 (evap system large leak detected) code? **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [August 28, 2015, 9:31am UTC](https://community.cartalk.com/t/could-a-failed-leaking-oil-pressure-sensor-cause-a-po455-evap-system-large-leak-detected-code/91020 "2015-08-28T09:31:39Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![tena](https://avatars.discourse-cdn.com/v4/letter/t/9fc348/32.png) [@tena](https://community.cartalk.com/u/tena)\ **Post date:** [August 28, 2015, 9:31am UTC](https://community.cartalk.com/t/could-a-failed-leaking-oil-pressure-sensor-cause-a-po455-evap-system-large-leak-detected-code/91020/1 "2015-08-28T09:31:39Z")
could a failed (leaking) oil pressure sensor cause a PO455 code?(eval emission system large leak detected) ---
**Author:** ![SteveC76](https://avatars.discourse-cdn.com/v4/letter/s/958977/32.png) [@SteveC76](https://community.cartalk.com/u/SteveC76)\ **Post date:** [August 28, 2015, 10:34am UTC](https://community.cartalk.com/t/could-a-failed-leaking-oil-pressure-sensor-cause-a-po455-evap-system-large-leak-detected-code/91020/2 "2015-08-28T10:34:31Z")
Nope, P0455 is a gross evap leak, have you checked to see if your gas cap is on tight? ---
**Author:** ![tena](https://avatars.discourse-cdn.com/v4/letter/t/9fc348/32.png) [@tena](https://community.cartalk.com/u/tena)\ **Post date:** [August 28, 2015, 11:02am UTC](https://community.cartalk.com/t/could-a-failed-leaking-oil-pressure-sensor-cause-a-po455-evap-system-large-leak-detected-code/91020/3 "2015-08-28T11:02:39Z")
that was the first thing i replaced when the code showed up. ---
**Author:** ![SteveC76](https://avatars.discourse-cdn.com/v4/letter/s/958977/32.png) [@SteveC76](https://community.cartalk.com/u/SteveC76)\ **Post date:** [August 28, 2015, 11:45am UTC](https://community.cartalk.com/t/could-a-failed-leaking-oil-pressure-sensor-cause-a-po455-evap-system-large-leak-detected-code/91020/4 "2015-08-28T11:45:23Z")
Year and make of car? ---
**Author:** ![tena](https://avatars.discourse-cdn.com/v4/letter/t/9fc348/32.png) [@tena](https://community.cartalk.com/u/tena)\ **Post date:** [August 30, 2015, 9:41am UTC](https://community.cartalk.com/t/could-a-failed-leaking-oil-pressure-sensor-cause-a-po455-evap-system-large-leak-detected-code/91020/5 "2015-08-30T09:41:33Z")
2005 chev trail blazer, ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [August 30, 2015, 6:00pm UTC](https://community.cartalk.com/t/could-a-failed-leaking-oil-pressure-sensor-cause-a-po455-evap-system-large-leak-detected-code/91020/6 "2015-08-30T18:00:49Z")
As was already said, these two issues are totally independent of each other. ---
**Author:** ![Barkydog](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/barkydog/32/2470_2.png) [@Barkydog](https://community.cartalk.com/u/Barkydog)\ **Post date:** [August 30, 2015, 7:11pm UTC](https://community.cartalk.com/t/could-a-failed-leaking-oil-pressure-sensor-cause-a-po455-evap-system-large-leak-detected-code/91020/7 "2015-08-30T19:11:55Z")
Bought a new gas cap from the dealer, fixed my check engine light for that code I think. 2003 Trailblazer. Agree with others, not related. ---
**Author:** ![jesmed1](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/jesmed1/32/2097_2.png) [@jesmed1](https://community.cartalk.com/u/jesmed1)\ **Post date:** [August 30, 2015, 7:29pm UTC](https://community.cartalk.com/t/could-a-failed-leaking-oil-pressure-sensor-cause-a-po455-evap-system-large-leak-detected-code/91020/8 "2015-08-30T19:29:55Z")
Have the system smoke tested. That will pinpoint the leak. Possible that mice have chewed through one of the evaporative emissions hoses, or that a plastic fitting on a hose has cracked.