So..last week driving home from work my check engine light came on, so when i got home i turned it off let it sit for a minute and turned it back on. The light was still on so i went for a drive around the block to see if i noticed anything funny at all, everything was good and the light went off after about 10 minutes. Then this weekend i went away on a trip about 350 miles each way, half way the light came on again so i pulled in at a rest stop to do a quick once over and all seemed good aside from the fact that my oil cap was about 1 turn lose...turned truck back on and the light was gone. Driving back home today the light came on again about halfway through the trip, stopped about 10 minutes later for a bathroom break, drove away light was still on but went off about a minute down the road. I drove a total of around 1000 miles this weekend and the light was on for maybe a total of 15 minutes....should I just forget about it, buy one of the diagnostic handhelds or pay some theifing shop?

 

year...model...engine...?

 

Year and what kind of truck? You may have a self diagnostic way to figure out what the code is by using a paper clip and the instructions here: http://www.off-road.com/toyota/tech/codes/index.html

But my first guess would be an o2 sensor those things set of the CELs like crazy if they aren't good

 

most likely = a dirty maf


spray with crc maf cleaner, spray again, reset ecu. done

 

Dont be cheap. Get your truck looked at

 

Seriously, at the very least, take it to autozone for a free reading.

I will say that my CEL acted like that when my pre-cat 02 sensor was on its way out though.

 

Clean your MAF

 

could you use a screw driver or anything of that nature if a paper clip isnt available? also on the 87+ vehicles, is there a pic of what they are talking about??

 

lol no a screw driver won't work, you'll see what I mean its the little box next to the fuse box, I think it says diagnose or something, look under the cap and it will show what little hole is each.

And someone said get it read by autozone, there isn't a computer reader for this year pickup/4runner it has to be done with the self diagnostic I'm pretty sure, someone else correct me if I'm wrong...

 

Its a 99 prerunner

 

X2 on advance auto or auto zone, using their OBD reader, saves a lot of $$

 

Dont have either one of those here Nowhere around here will scan for free either its $60 anywhere I go.

 

Why'd you think that?

 

I didn't know it was a 99 when I posted that, I was under the impression it was an older pickup, OBD didn't start untill the mid 90's I thought, but I've been wrong before lol

 

I was just messing with ya man!

 

autozone does diagnosis checks on 96 and newer.

 

I know but I'm hoping someone can correct me on that if I'm wrong lol