Problems with a o2 simulator

[ska8r123]

i have a catless downpipe and made a mechanical o2 simulator out of 18mm sparkdefoulers i installed it today and cleared the codes before i started the car, and the cel light stays off for like 3 seconds then comes right back on. does anyone have any ideas as to why the light is still coming on and the o2 sensor is way away from the pipe?

[xEJ20x]

Are you running the stock bpv or a bov.

Also...sometimes using 2 foulers causes a bad o2 sensor code.

[ToTheIX's]

yea you might be too far out of the pipe, so its getting too low of a reading and thinking the cat is bad

[ska8r123]

Originally Posted by ToTheIX's

yea you might be too far out of the pipe, so its getting too low of a reading and thinking the cat is bad

You think i should just use the defouler i drilled out or the regular normal defouler, and i have a turbo xs bov rfl. thanks for the responses

[xEJ20x]

Originally Posted by ska8r123

You think i should just use the defouler i drilled out or the regular normal defouler, and i have a turbo xs bov rfl. thanks for the responses

The RFL is causing too much unburned fuel to hit the sensor.
Anything beyond a 50/50 vent will throw the p0420.

Time for a reflash that removes the codes.

[ska8r123]

but the problem is its not throwing a p0420 code its throwing a p0031 and that is H02S bank 1 Sen !heater circuit Low any ideas what to do im runnin out of sunlight for the day. please someone help.

[TROLL]

i've always used 2 fowlers and drilled out the one closest to the sensor and not the other one, never had a problem.
also didnt know that bov's affected it either but i guess i dont have much personal experience with it all.

[xEJ20x]

Originally Posted by TROLL

i've always used 2 fowlers and drilled out the one closest to the sensor and not the other one, never had a problem.
also didnt know that bov's affected it either but i guess i dont have much personal experience with it all.

When I first had my downpipe on, I was running a Worx adjustable set at 50/50. No codes were thrown until I went 75% vent or 100%.

[xEJ20x]

Originally Posted by ska8r123

but the problem is its not throwing a p0420 code its throwing a p0031 and that is H02S bank 1 Sen !heater circuit Low any ideas what to do im runnin out of sunlight for the day. please someone help.

I'm pretty sure thats the o2 sensor thats in the exhaust manifold before the uppipe.
Either that one went bad or it isn't plugged in.

[xEJ20x]

Some guys wires to the o2 sensor melted.

http://www.clubwrx.net/forums/showthread.php?t=82038

[ska8r123]

does anyone no wat the code im getting means n drill the defouler near the pipe or drill the one after the pipe. i need an inspection and im so screwed right now.and i never had the cel before i installed the downpipe. im really thinking that the 02 sensor is bad

[xEJ20x]

If you are getting a p0031 then its from the first sensor in the exhaust manifold.

But honestly, you should have gotten the inspection done before you put the downpipe in.

[ska8r123]

so the o2 sensor in the downpipe right thats the only one other then the one in the uppipe. and i had the downpipe put in right after my last inspection a year ago. and was in the hospital for a while so i physically couldnt do it.

[xEJ20x]

Originally Posted by ska8r123

so the o2 sensor in the downpipe right thats the only one other then the one in the uppipe. and i had the downpipe put in right after my last inspection a year ago. and was in the hospital for a while so i physically couldnt do it.

What I have circled in red is the o2 sensor you are looking for.
It is in the exhaust manifold on the passenger side, before the uppipe.

[ska8r123]

but the cel came on when i replaced the downpipe i still have my stock uppipe on there. so i really dont think it s the 02 sensor on the uppipe i dunno what to do.

[xEJ20x]

Originally Posted by ska8r123

but the cel came on when i replaced the downpipe i still have my stock uppipe on there. so i really dont think it s the 02 sensor on the uppipe i dunno what to do.

It is not the sensor on the uppipe, that is the EGT sensor.

You are throwing a P0031: Front oxygen (A/F) sensor heater circuit low input.
The problem is with the O2 sensor that is in the exhaust manifold.
Before the uppipe.


Can someone else step in here...I feel like I'm gettin nowhere.

[TROLL]

yeah sounds like a coincidence that you did the DP and threw this code, but if thats the code you're getting its definitely the front 02 sensor that is the problem, which is the one that ej20 circled for you... its just before the uppipe, on the exhaust manifold. if you pull your pass front wheel off and peel back the fender liner some you should see it, or take the splash guard off the underside of the car and look from underneath... its not too tough to get to but unfortunately its not cheap to replace.

[IMPREZvWRX]

I just found this thread. Just the fact that the CEL came on so quickly would have ruled out a P0420.
With it being the heater circuit in the front O2, you probably have noticed that the car runs a little rough until it's warmed up. That's what I experienced when my front O2 heater went bad. Plan on spending $225-275 to replace it.

[ska8r123]

Thanks alot guys so im looking on spending a lil over 200 you think it may have just came unplugged. i check today if it doesnt rain and let everyone know. thanks again ive been stressing over this for a while now.

[ska8r123]

is there a way to rig this up so i dnt need to buy another sensor like i did with the downpipe, and is there a def way to find out if it is bad for sure before i go out and spend the money on a new one. thanks alot sorry if my questions are dumb