crazybluecivic

Ok so over the weekend i converted my Lx exhaust to a Ex same head d17a1

now the cat from the ex was oem i used a dc carb legal header

now here is where my issue began

everything fit perfectly but im throwing 2 code

1st code : PO135 O2 heater circuit ( bank 1,sensor 1)

2nd code : PO141 O2 heater circuit ( bank 1,sensor 2)

now from the lx o2 sensor need extending so i did so

first i crimped them made sure to use the wright gauge wire and everything this still gave me these 2 codes even when turned off they would still pop back up

second try to fix it i sauterd the wires makeing sure each wire was where and how it should be connected for proper conduction and protection from the weather aka water

i still threw those 2 codes

after i turn off/erase the codes wright after starting the car the check egine light pops wright back up **like its mocking me *** grrr

so wright now i cant pass california smog and my car is possibly running rich

also i would think i should go into limp mode and i have not weird

i have a lx ecu and im thinking maybe this is the issue im realy dunno at this point thats why im asking for help ideas to fix my issue or anything to test for

thanks honda-tech and the 7thgen community for any one that tunes in and helps me out to fix this issue

also the o2 sensors are like brand new 100 miles on them bosch

b0yg0tskills

it might just be that your buring more fuel and whatever else more than usual. cause i know when i switched my LX exhuast to a header/full catback exhuast it ran fine but it did throw a check engine light for a little bit. how long has the car been running like this?

crazybluecivic

3 days the car has run like this

and the o2 have not turned off

im still throwing this code error

crazybluecivic

bump please realy need help

no ideas

crazybluecivic

any ideas ht

realy want to get this fixed

crazybluecivic

Bump updated still throwin a

1st code : PO135 O2 heater circuit ( bank 1,sensor 1)

any help

crazybluecivic

No help ht please

ap1 george

you should be able to put 1 in..the one on the down pipe..but as far as the one on top where the header is just plug the male part of the harness to the female but you just leave the actually sensor securely hanging..this did the trick for me and i dont have a check engine light

crazybluecivic

yeah CA smog shops will fail me for that

i can trick it more than likely but i truly want to fix it

im just throwing one code the

p0135 bank 1 sensor 1

its a brand new bosch and the mil still comes on aka the check engine light

i dont know where the grounds are for the first o2

and has anyone heard of bosch throwing a heater circut code VS oem honda o2

julezeve

dam still having the same problem huh?
man I am still screw over the immobilizer to lol??
still thinking about the headswap?

HONDAPARTSMANMIKE

both codes you are throwing are heater code meaning you will need new sensors. but first check and make sure you didnt blow any fuses and you connected the wiring correctly.

slowcivic2k

Check the fuses. There are two fuses that can blow, and they vary by model, so make sure yours are no blown. There are at least 2 oxygen sensors that this vehicle uses depending on model. A front O2 sensor with a gray connector is a traditional O2. If it has a blue connector, it is a LAF sensor, and are very expensive, yet prone to failure. Disconnect the harness from both sensors, and check the resistance of the heater elements if your wiring and fuses check out. Resistance should be 4-12 ohms if memory serves me.

Because the codes some back right away, its obviously an electrical issue. The PCM will verify all the circuitry that it can before running.

crazybluecivic

I am only throwing one code now the P0135 not the P0141

where are the fuses for the 7th gens


i dont know where the fuses would be would you know boss?

also ive heard to check the grounds where would these be?

i dont have a blue wire just a black 2 whites and a grey i beleive no blue tho

i just need the p0135 to get fixed i droped a brand new bosch sensor and it still throw

im about to order oem and try that

trial and error = $$$$$$ grrr

applematt

i did something similar. you need to get an ex ecu and check to see if the sensors are the correct ones. apparently there are some subtle differences in them

2002civicrider

How did u get rid of the lower o2 sensor code?

Just because u switch to a ex exhaust setup it shudn't have anything to do with the ecu. If u have the o2 sensors plugged into the primary and secondary you should b good to go.

applematt

im sorry, i miss read your post. ur problem is the fact that the lx civic has a very different exhaust setup than the ex. this is not b series or earliy d series. and its not obd 1. you can just go around mixing and matching random parts and expecting them all to work. if you are using new sensors then its because they are meant to be read by and ex computer. so its throwing a code. i already went through a similar problem with mine so either switch back to stock, cause an ex exhaust on a lx motor doesnt do anything, find o2 sensors that your lx computer will read, or swap out for a real ex motor to match the exhaust.

chawski

ha im still tryin to figure out the reason that you would do this swap?

crazybluecivic

update : P0135 still throwing a code after switching to a OEM lx sensor no bosch

im looking for a fuse for this sensor and have no idea where to start

and to answer the question why i switched to ex from lx exhaust is = styling and sound and i plan to switch to a ex head and ecu soon no k24 for my DD

brutekiller787

i had the same problem on my 97 lx and it turns out the entire ecu was bad. hope that's not you...

crazybluecivic

For one code the ecu was bad

i hope this isnt my case i realy need fuse info

or some tips i hav till the 8th

metalviper

2 things nobody has mentioned yet, the 04-05 use wideband & 01-03 use narrow band sensors. Make sure that you are using the correct sensors for your year. the other is, depending on how you exactly crimped the new sensors, this may have introduced resistance into your sensor circuit & could be enough to simulate a faulty O2 sensor

crazybluecivic

im using the OEM 03 lx sensor

and i did not crimp any wires i am using a nice o2 extender with a male and female end
and it workes perfectly for the bottom o2 ( down stream)

But for some reason im still throwing a upstream sensor code po135 the headers and downpipe to cat are jet hotted can this effect it cause i know it is a heater circut code

or can it be a fuse issue from a previous extend gone bad ( cause a short blown fuse )

im runing out of ideas worst case senarior i switch back to lx for a day to smog then switch it back but then it not a good swap in my eyes

add: plus i just checked the fuse for the LAF meter and it was still good

crazybluecivic

Probelem fixed wrong engine harness

turned off codes but now i have a egr for a lx engine should i just keep it on so when i do the ex conversion