# P0420 code on a 2006 Subaru Impreza

**URL:** <https://community.cartalk.com/t/p0420-code-on-a-2006-subaru-impreza/170835>\
**Category:** Maintenance/Repairs\
**Tags:** impreza, subaru\
**Created:** [October 5, 2020, 4:19am UTC](https://community.cartalk.com/t/p0420-code-on-a-2006-subaru-impreza/170835 "2020-10-05T04:19:37Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Pran-75](https://avatars.discourse-cdn.com/v4/letter/p/8e7dd6/32.png) [@Pran-75](https://community.cartalk.com/u/Pran-75)\
**Post date:** [October 5, 2020, 4:19am UTC](https://community.cartalk.com/t/p0420-code-on-a-2006-subaru-impreza/170835/1 "2020-10-05T04:19:37Z")

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My Impreza has been leaking oil, I think from the head gasket on the right cylinder bank. Could be the valve cover gasket, as the exhaust still seemed clean. But all of a sudden, the exhaust is blue and the check engine light came on. It’s code P0420, so it’s a catalytic converter issue. Is it possible the two problems are related? Could I have burned enough oil to foul the converter?

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [October 5, 2020, 4:21am UTC](https://community.cartalk.com/t/p0420-code-on-a-2006-subaru-impreza/170835/2 "2020-10-05T04:21:32Z")

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> [@Pran-75](#):
>
> Could I have burned enough oil to foul the converter?

Yes.

Tester

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**Author:** ![Pran-75](https://avatars.discourse-cdn.com/v4/letter/p/8e7dd6/32.png) [@Pran-75](https://community.cartalk.com/u/Pran-75)\
**Post date:** [October 6, 2020, 8:24am UTC](https://community.cartalk.com/t/p0420-code-on-a-2006-subaru-impreza/170835/3 "2020-10-06T08:24:18Z")

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Thank you very much