1988 Buick Lesabre code 43

Tiny
TOOLMASTERDAVE
  • MEMBER
  • 1988 BUICK LESABRE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 178,000 MILES
Hello, I keep getting a code 43 on this buick. I have looked at a Motor manual and it says that it is either the esc or the knock sensor or the wiring. Well, I cant find the knock sensor cause the book says its under the tps and I have looked and it is not, where is the knock sensor so I can check it for low voltage? I guess that is my first step to figuring out what is wrong. Thanks dave.
Thursday, April 24th, 2008 AT 9:22 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
See below for a 3.8L


https://www.2carpros.com/forum/automotive_pictures/12900_tps_2.jpg



For 3800 its on lower right corner of engine block
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Thursday, April 24th, 2008 AT 11:50 PM
Tiny
TOOLMASTERDAVE
  • MEMBER
  • 4 POSTS
I wish this were the picture of my engine but its not, its close, but there is no knock sensor there. I did find what I think is a knock sensor under the rear of the motor on the pass. Side block, close to the pulleys and close to the oil press sensor. It has one wire that has a long prong going into it and its hard to see from the top of the engine. Is it possible that this could be the knock sensor? I think it has a dark green wire.
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Saturday, April 26th, 2008 AT 9:29 PM
Tiny
BUZZSAW
  • MECHANIC
  • 1,198 POSTS
What is your 8th number or letter in your vin #

it may have 2 knock sensors. Also is this a limited or custom or standard lesabre

my picture shows it under the exhaust manifold in the front head for vin k and Vin L

in the head by the firewall for vin 1 and vin c

and vin J is where razzy said
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Saturday, April 26th, 2008 AT 9:50 PM

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