Need Help On A CEL Code

S

s8tan

Member
Well a couple months ago I install the FS-ZE intake manifold, and a Bosal 4-2-1 header. And a catless 2.5" exhaust system. Since then my car has been burning oil. So I took it back to the shop that did the mods for me. They did a compression test on the motor, PASSED. Then he did a complete leakdown test, PASSED!!. So after the leakdown test was complete a CEL appeared? The past 2 months the since i've been burning oil no CEL. Now one appears. The code came up as P0037. Does anyone have any clue what the code means?

Much help appreciated.
 
Youve got a CEL because you have not catalytic converters. Sometimes it comes right away, though it took almost 250 miles of driving for mine to show up. Im 100 percent sure thats what it is. There is no way to bypass that without buying a CEL fix.

you dont need to double post...please remove one of the posts, since you posted in AT LEAST two forums.
 
The P0037 Code is related to the HO2S heater. (Heated Oxygen Sensor)
Which is most likey related to your headers.
Did you remove the sensor completely or have it re-tap further back?
 
it doesnt matter...without cat converters hes gonna throw a code if he chopped the o2 sensor off or relocated it or whatever he did.
 
Sorry meant to say eliminator which are suppose to trick the sensor, though believe some said it didn't work all the time.

Don't matter really, just cover up the CEL light and cont on :)
 
P0037 -

Heated o2 Sensor Rear Malfunction

is the exact code...in other words, you have no cats, it thinks it ****** up.
 
wishi wouldnt have wasted my time calling the dealer for him to find out the exact code...in any case, the only thing you have ever been wrong on is the limp mode. im running no cats with a CEL for 1k miles almost now, no limp mode. but normally your info tends to kick ass, despite your slightly lacking interpersonal skills (that was kind of a compliment, so no flames). but in any case,...

WHY ASK THE SAME QUESTION EIGHT TIMES
 
razor, I don't want to argue with you about the damn "limp mode" s*** again... but think LOGICALLY for a second...
q1) what does the O2 sensor do?
a1) monitor fuel ratio
q2) what blows up engines?
a2) commonly: over revving and/or lack of oil and/or lack of fuel
q3) what happens when the O2 sensor dies?
a3) give false readings to the ECU and the ECU goes "wtf?"
q4) what does the ECU do after the O2 sensor dies?
a4) goes "wtf" and then say "**** you" to the O2 sensor readings and just goes on its SUPER SAFETY factory fuel map preset... that means run super rich
q5) why does the ECU want to make the engine run super rich?
a5) prevent the engine from blowing up, see a2
q6) what does "limp mode" mean?
a6) see a4

so you want a better answer (or just verify it)? I'd talk to a technical school automotive repair instructor, or an engineer from the Society of Automotive Engineers

PLEASE THINK
 
once again, your people skills amaze me :rolleyes:, but then why am i not having any problems at all?
 
you're not having "problems" because the ECU is playing safe and keeping your engine from blowing up

also, there are weird cases that throwing on a header won't trigger a CEL at all (like UPSman's car)... what the determining factor is the 1st and 2nd O2 sensor readings... they can't be the same, and they can't be radically different from each other either... so there is a threshold/tollerance in the ECU's programming that "logically" determines if the sensor is "bad" or not... from what I understand, if the sensor readings are the same, then the ECU thinks the cat is bad or is not there... and if the readings between the 2 sensors are far off, then a sensor is bad... how the ECU determines if the sensors are functioning properly or not is by monitoring the voltage (after all, that's what the O2 sensor really outputs anyway)... NORMAL sensor readings should go from low voltage (about 0.5-1 volts) to high voltage (4.5.4.9 volts or so)... and back again over and over... it should never hits 0, nor hit 5... it should never stay at a constant voltage either... when both of those conditions occur, the ECU determines the O2 sensor is bad

this is standard practice on ALL cars on the road today... this is NOT a mazda specific thing
 
so if the ECU is playing it safe (please excuse me im not nearly as technical as you are, and i know you tend to flame those of us that arent :(), then if i installed a CEL fix, would my car run faster/better than it is already? so the computer right now is doing its job, so i have nothing to worry about maintence wise? or over a period of time is my engine in danger?
 
and the "CEL fix" thing is really an O2 sensor simulator box... it has chips and circuits inside the box that takes the readings from the O2 sensor, alters it a bit to simulate a working O2 sensor... this works on OBD-2 cars because of actual engineering needed to fool the ECU

the olden way of "fixing" it is just splicing a resistor into the O2 sensor harness... this works pretty good with lots of pre-OBD2 ECUs... but the new OBD2 ECUs just demand too much dynamic readings from the sensors and is too damn smart with diagnostics... so in otherwords, this way doesn't work very well with OBD2 ECUs at all... it sure is cheap though
 
yea, it gets rid of the CEL...but to pester you again, can you tell me the answer to my question about the engine life, etc in the post right before your last response...

PS - how come it never shows you as online?
 
nothing major will go wrong, but here are the usual long term effects:

-major carbon build up in intake manifold (more than normal)... the carbon build up comes from the EGR system... the EGR system is passing immensely rich exhaust gases back to the intake system... normally it doesn't do that
-fouled plugs faster
-reduced performance of car due to crappy (rich) fuel ratio
-major carbon build up in exhaust system
-plugged up EGR valve (see the first thing)... the onset of carbon build up in the intake manifold is first though
-damaged catalytic converter (you don't have to worry, since you don't have one! (lol) )
-bad fuel economy
-poor emissions

RazorP5 said:
so if the ECU is playing it safe (please excuse me im not nearly as technical as you are, and i know you tend to flame those of us that arent :(), then if i installed a CEL fix, would my car run faster/better than it is already? so the computer right now is doing its job, so i have nothing to worry about maintence wise? or over a period of time is my engine in danger?
Click to expand...
 
ok, so what can i do keeping the catless system, to improve performance and gas mileage? (i can deal with quicker fouling plugs, and extra carbon buildup)

What will the result be of a plugged up EGR valve?

Damn, i always thought you were an ass edwin (?) but it turns out if you kinda *ignore* your flippant remarks, you have incredibly useful information. Sorry about flaming you before.
 
plugged up EGR valve will result in ANOTHER code in the ECU... EGR valve malfuction

when the EGR system goes broke, NOx emissions increases.. but that's the least you have to worry about since you don't have a cat

just get your damn O2 sensor box and it'll fix all of these problems

plus your car will haul more ass
 
well ******* A thats sweet as ****...now who sells what YOURE talking about...im pretty sure both links i know of sell the resister thingy, cause theyre like 20 bucks!
 
find something for a late model camaro z28... they are real boxes... not some damn resistor... I KNOW they work

check ls1.com
a bunch of guys there are running headers and straight pipes... they have good info
 
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