Knock Sensor location needed for replacement engine?

HFRANKLIN57278

MEMBER
1991 LEXUS ES 250
2.5L
V6
2WD
AUTOMATIC
179,000 MILES

I recently replaced the engine in the vehicle listed above. The check engine light showed a knock sensor code. The new refurbished engine has no port for a Knock sensor. The old engine has the knock sensor located underneath the intake manifold. The new engine does not have a port. Is it possible that the engine does not use a knock sensor? If so, how do I remove the check engine light or is the port located somewhere else?

Thursday, August 3rd, 2023 AT 10:01 AM

2 Replies

KEN L

MASTER CERTIFIED MECHANIC
51,537 POSTS

If the old engine has a knock sensor and the replacement does not install the knock sensor onto the wiring harness and try to bolt it to the engine somewhere. Here is the location of the stock sensor. Check out the images (below). Please let us know if you need anything else to get the problem fixed.

Image (Click to make bigger)