So I just bought this truck... turns out they previous owner removed knock sensor harness. I put one back on and got rid of the code 52 but after putting it back together I now have a code 12 and 42. What should I do next. I知 stuck

 

Oh, I dunno. You could look up what those codes mean. Unless you were just hoping that somebody on this site had memorized the descriptions and diagnoses of all 20 codes.

 

Off painful memories...52 is the Knock Sensor Code, 42 is the speed sensor signal code.. You'll have to figure out 12 on your own. What I would do next is getting myself a copy of the Toyota factory service manual.....

 

oh ok smart ass looking for honest opinions so unless you can help and not be a dick then butt out

 

ok thanks I値l look into the speed sensor issue and with the code 12 I値l research done more. Also Do you know of any good vacuum hose diagrams for the 90s 3vze?

 

Here's one, but if you search the forum you'll find many threads about vacuum lines with very detailed schematics.