# Block sensor **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [March 22, 2008, 8:02pm UTC](https://community.cartalk.com/t/block-sensor/12087 "2008-03-22T20:02:38Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![unionave](https://avatars.discourse-cdn.com/v4/letter/u/9de0a6/32.png) [@unionave](https://community.cartalk.com/u/unionave)\ **Post date:** [March 22, 2008, 8:02pm UTC](https://community.cartalk.com/t/block-sensor/12087/1 "2008-03-22T20:02:38Z")
2002 Subaru Outback Sp. w/ 65k. Check engine light went on, took to auto zone for reading and said block sensor replacement. How serious is this and how much $$$? Guy at auto zone said pretty common for subarus. ---
**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\ **Post date:** [March 22, 2008, 8:06pm UTC](https://community.cartalk.com/t/block-sensor/12087/2 "2008-03-22T20:06:05Z")
I Hope you mean ‘knock sensor’ This is a simple sensor screwed into the side of the engine block, and sends a signal to the computer if it senses knocking and pinging. This should be a simple remove and replace. They are typically mounted so that there is no danger of fluids leaking or major dis-assembly required. ---
**Author:** ![unionave](https://avatars.discourse-cdn.com/v4/letter/u/9de0a6/32.png) [@unionave](https://community.cartalk.com/u/unionave)\ **Post date:** [March 22, 2008, 8:34pm UTC](https://community.cartalk.com/t/block-sensor/12087/3 "2008-03-22T20:34:38Z")
Oops, yes, knock. ---
**Author:** ![Skypilot](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/skypilot/32/237_2.png) [@Skypilot](https://community.cartalk.com/u/Skypilot)\ **Post date:** [March 22, 2008, 9:07pm UTC](https://community.cartalk.com/t/block-sensor/12087/4 "2008-03-22T21:07:46Z")
Here is the price for a 2.5L engine: > **[Shop by Vehicle Model at AutoZone](https://www.autozone.com/shopbymodel)** > > AutoZone offers Free In-store Pickup and auto replacement parts for your Vehicle Model. Could not find one for the 3.0L engine