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o2 sensor problems

This is a discussion on o2 sensor problems within the Computer & Tuning forums, part of the LSx Technical Help Section category; my 2002 35th has been getting o2 sensor codes 1133,0155.the chevy dealer last year couldn't find anything wrong.keep getting ses ...

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    Angry o2 sensor problems

    my 2002 35th has been getting o2 sensor codes 1133,0155.the chevy dealer last year couldn't find anything wrong.keep getting ses lite.having trouble passing emmissions due to dtc's.the car has 8k on it.it seems they are not heating up but on scan they seem to be working.does anyone believe i need 4 new sensors because lack of use?chevy replace two about 3 yrs ago.is this an emmissions warranty?need help!!o2 sensors are $74 each.all wiring and voltage cks are ok.

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    Member Tman's Avatar
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    I believe both of those codes are forward of the cats.
    Have you made any modifications to your car? added oil to perhaps your K&N filter?

    I would start first with possibly cleaning the MAF and see if that helps. Clear both codes,and see if they come back after several monitoring periods by the ECM.

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    Asshole bige97's Avatar
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    the p1133 is a HO2S Insufficient Switching(Bank 1 Sensor 1) an p0155 is 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)

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    Member Pete Rock98's Avatar
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    Sounds like your catalytic converters are shot.Since you said they replace both 02's.Bad o2's can make your car run rich and could dump raw fuel into the cats and ruin them.

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    Smile 02 sensors

    Quote Originally Posted by bige97 View Post
    the p1133 is a HO2S Insufficient Switching(Bank 1 Sensor 1) an p0155 is 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
    you are correct about the codes.i replaced all 4 sensors and now im still getting a 1155 code.i have since found the harness for the lh frt sensor melted but the wires ohmed ok.iread that these wire are very sensitive to heat and i have ordered a replacement harnes for it.i have headers installed and the harness is a 24" extension.will get back when i replace the harness.thanks for you feed back.

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    Bumping this because it also pertains to my problem in my thread.

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    Veteran 0rion's Avatar
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    those are very common codes to have with headers.....it's due to the sensors being moved further down stream. I've heard of people trying all kinds of stuff to try and fix it. I was getting heater codes and last fall switched to bosch 13111's (vette rear) sensors and haven't had the code all year this year. I'm not convinced that's the fix either because it doesn't work for everyone but it did for me.......so far.

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    Smile 02 sensors

    i've replaced all 4 sensors with the bosch type.i'm not getting a lite now,but i'm getting and impending 1133 code on my scan tool.i'm going to replace my left front harness due to it had some heat damage.the wiring ohmd ok,but i read that these wires and plugs are real sensitive to heat,so i'm going to give that a try.thanks for your input with the vette sensors,we are thinking on the same lines.

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    I deleted the insufficient switching code. Mine threw the code even with new 13111 sensors. HPTuners FTW

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    LS1 chosen son lemons12's Avatar
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    Quote Originally Posted by bige97 View Post
    the p1133 is a HO2S Insufficient Switching(Bank 1 Sensor 1) an p0155 is 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
    Quote Originally Posted by papalavac View Post
    you are correct about the codes.i replaced all 4 sensors and now im still getting a 1155 code.i have since found the harness for the lh frt sensor melted but the wires ohmed ok.iread that these wire are very sensitive to heat and i have ordered a replacement harnes for it.i have headers installed and the harness is a 24" extension.will get back when i replace the harness.thanks for you feed back.
    corvette o2s for the win... i had same problem with my extensions and it took all my problem away..

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    ok guys im back.the harness didn't really fix it.i drove for about 500 miles and it was ok.i fueled up the second time and got the lite the second start on a cold morning.got both the 1133 and 1153 codes.the book says bad fuel possible.i would like to know if there is a way to delete the switching codes from the computer?do i need a tech 2 to do this?thanks in advance.i'm up the wall with this problem.
    Last edited by papalavac; 11-25-2008 at 02:25 AM.

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    LS1 chosen son lemons12's Avatar
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    Quote Originally Posted by papalavac View Post
    ok guys im back.the harness didn't really fix it.i drove for about 500 miles and it was ok.i fueled up the second time and got the lite the second start on a cold morning.got both the 1133 and 1155 codes.the book says bad fuel possible.i would like to know if there is a way to delete the switching codes from the computer?do i need a tech 2 to do this?thanks in advance.i'm up the wall with this problem.
    you can turn them off.. but they will just come back.. you gotta find the problem...


    what have you changed so far?

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    Quote Originally Posted by 0rion View Post
    those are very common codes to have with headers.....it's due to the sensors being moved further down stream. I've heard of people trying all kinds of stuff to try and fix it. I was getting heater codes and last fall switched to bosch 13111's (vette rear) sensors and haven't had the code all year this year. I'm not convinced that's the fix either because it doesn't work for everyone but it did for me.......so far.
    This worked for me too Orion,,,thanks for putting me on to this. I haven't had those codes come back all year long.

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    Quote Originally Posted by lemons12 View Post
    you can turn them off.. but they will just come back.. you gotta find the problem...


    what have you changed so far?
    i changed all 4 sensors with bosch 13444's,also replaced front lh harness due to heat damage.scan tool says everything is working norm,but it usually happens on a cold morn start.usually the second start.sometimes as the last,after about 500 miles.i can see that if they are farther back,front sensors,because if the headers,it might set a lite,but i know guys with firebirds who don't have this problem.i was asking if the computer can be programed for the front sensors to correct the problem,or am i going to have to live with it.the gm manual says when both codes come together it could be bad fuel.
    Last edited by papalavac; 11-25-2008 at 03:07 PM.

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    Quote Originally Posted by 02blkws6 View Post
    I deleted the insufficient switching code. Mine threw the code even with new 13111 sensors. HPTuners FTW
    just how did you delete the switching codes.i'm done replace parts.i told chevy it was a computer problem,they said no.thanks,papalavac

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    TunedbyFrost.com Tuner Frost's Avatar
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    Quote Originally Posted by papalavac View Post
    i changed all 4 sensors with bosch 13144's...

    The Bosch/vette sensors that everyone else in this thread are talking about are part# 13111, not 13144.

    Quote Originally Posted by papalavac View Post
    just how did you delete the switching codes.i'm done replace parts.i told chevy it was a computer problem,they said no.thanks,papalavac
    You need tuning software like LS1edit, HPTuners, or EFI Live. You can send the computer to me for mail order tuning and have it done as well... http://www.lsxtune.com/shop/product_...roducts_id/631

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    Angry o2 aensors

    my bad they are 13444 sensors,not 13144 sensors.they are direct 4 wire replaement sensors.i don't believe its the sensors as it is the computer failure to read them.same problem with stock a/c sensors.

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    Veteran 0rion's Avatar
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    Quote Originally Posted by papalavac View Post
    my bad they are 13444 sensors,not 13144 sensors.they are direct 4 wire replaement sensors.i don't believe its the sensors as it is the computer failure to read them.same problem with stock a/c sensors.
    I can tell you the theory behind the vette sensors although I don't really know if I believe it myself. The theory has been that bosch 13111 have better heaters in them since they're the rears on the vette and are so far down stream. I've read conflicting info as to whether that's actually true. I know they've worked for a few people including myself and Firebirdjones. We both went to those over the summer and I haven't had a switching code or heater code since. Now, would simply just putting new stock replacements in have done the same thing? I don't know, but I do know the 13111's have kept me from getting either code thus far.

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    Unhappy o2 sensors

    chevy replaced both front sensors and that didn't help my problem either.so it was recommended i use bosch sensors.13444 are for the front and back for camaro's.i still believe its a computer problem of not reacting to the sensors.when you scan,all readings are norm including the switching and heating.i told chevy this and they said it was the headers.i already bought 4 new sensors,so i don't wanyt to buy more and have the same problem again and be out more cash.thanks for your input.maybe i should have went for the vette sensors.!!!i think a computer adjustment might be the way to go.

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    Veteran 0rion's Avatar
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    it is the headers. The headers moved the sensors further down stream. Send your pcm to frost and he'll hook you up.

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