Seems like its on most of the time. I disconnected the battery and it reset and did not come back on for about 15 min of driving. It has 228k so the wire or sensor could very well be bad I guess. Either way I would have to buy new parts so might as well try the least evasive approach first I guess.

 

yeah, go for it. i can't remember exactly, but i want to say my knock sensor was somewhere around $150 new (that could be very wrong though ... it was about 2 years ago i replaced it). the pigtail is cheap though. i've got 254k on mine and the wiring is very green.

in the mean time if you want, you'll get a LITTLE more power out if it running poorly by advancing the timing to about 15-18 btdc and running premium. easiest route is just to fix it . lemme know how it works for u

 

Thanks for the advice, I'll let you know how it turns out.

 

I recently solved my code 52 on a 95 4runner. The original engine died with about 165,000 miles and I replaced it with a reman from Oregen Engine. Once the new engine was in place, I started getting a code 52.

I stared by replacing the pigtail, then knock sensor, then ECU. No luck. Finally solved by purchasing a new knock sensor from Toyota. Apparently the non Toyota sensor was the problem.

 

Updates like that are appreciated, Dan. I wonder how many code 52's would have went away with OEM vs aftermarket.......

 

And I was just expecting to get heckled for a 5 year bump. Honestly, I searched numerous forums and threads dealing with this problem and while there doesn't seem to be a single solution, I think the best procedure is:

(1) Replace Pigtail,
(2) Replace Knock Sensor with OEM Toyota Part,
(3) Replace ECU.

I found a used ECU for $30 so at that price, I would probably move it ahead of replacing the sensor, which cost significantly more. And I certainly support spending a little more for OEM parts when dealing with this issue.