Knock sensor

KWSTINE86

MEMBER
2003 CHEVROLET IMPALA
6 CYL
FWD
AUTOMATIC
144,000 MILES

How do you remove the knock sensor on the back side of a 2003 impala 3.8l the one closest to the fire wall do I need to drain the antifreeze and what special tool do I use because I can not get a socket to it.

Saturday, October 23rd, 2010 AT 9:57 PM

3 Replies

BLUELIGHTNIN6

MECHANIC
16,542 POSTS

This knock sensor is very difficult to replace. It is on the back/bottom of the engine next to the trans axle.

See the diagrams below for instructions on replacing it

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Saturday, October 23rd, 2010 AT 10:06 PM

ZACCHEUS HOLT

MEMBER
1 POST
2005 CHEVROLET IMPALA
3.8L
V6
RWD
AUTOMATIC
195,000 MILES

I need to replace the knock sensor on bank 2. But I have no idea how to remove it. The source between the oil pan and transmission is to tight to squeeze a socket through. Any ideas?

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Wednesday, October 17th, 2018 AT 6:33 PM (Merged)

HMAC300

MECHANIC
48,601 POSTS

The transmission has to come out then drain cooling system. Remove shield around it. I do not see any tips from mechanics. Maybe if you got lucky and used an open end wrench from the side. Be sure not to over tighten if you do it destroys the sensor and you have to replace it again.

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Wednesday, October 17th, 2018 AT 6:33 PM (Merged)