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service engine light

This is a discussion on service engine light within the General Help forums, part of the LSx Technical Help Section category; ok guys so i get the check engine light while i was done racing a scion, i get two codes ...

  1. #1
    Junior Member ricefordiner's Avatar
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    service engine light

    ok guys so i get the check engine light while i was done racing a scion, i get two codes the both back o2 sensors. But last year i got the both front o2 sensor codes i replaced the front but really didnt see a difference. So my question is, may the catalytic converters be bad or should i first by the rear sensors and then see if that solves my problem. comments will be greaty appreciated.

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    NY Representative basballny2's Avatar
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    hows the car driving? clear the codes and see what happens

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    Senior Member Orcus79's Avatar
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    It might have been a one off thing from fuel loading after the race. clear the codes and wait to see if they come back.

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    Veteran 0rion's Avatar
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    what were the codes? Could very well be cats which are still under warranty for you if you're less than 120k miles.

    down at about post 13
    P0430: 2nd Bank not efficient..could this be prob
    Last edited by 0rion; 02-09-2009 at 08:36 PM.

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    Member Red99TA's Avatar
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    sounds like what I had, P0137 and P0157, not sure if those are your codes, it would almost feel like fuel was being cut off at around 2k under light to medium acceleration, turns out it was my maf, since Ive replaced it car runs smooth, I think the reason it throws O2 codes instead of the maf is bc the O2's are trying to make up for what the maf is screwing up, just my long .02

    ps try cleaning your maf, if you have to replace go oem, i got mine for 50 shipped from lsx heaven on here

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    Junior Member ricefordiner's Avatar
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    so i went to get my codes read and on the way there the check engine liight came off! I was like what tha fu**(*()(. The codes were P0137 and P0157 jus like iwishihadanlt1. And i was thinking that maybe because i got codes for the first two 02s and now the back one my cats could be bad. but let me try cleaning the maff too and see what happens.

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    Junior Member ricefordiner's Avatar
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    And it gets weirder cause the car has 71000 miles on her so i am thinking its the cats.

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    Junior Member ricefordiner's Avatar
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    o and could having bad cats have an impact on gas mialege?

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    Member Red99TA's Avatar
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    I had the same exact issue, usually if its the cats the light will be blinking which usually means catalytic failure, my light went off for about a week, turned back on with the same codes, couple days later filled up on gas and turned off about 4 miles after filling up, I tried cleaning the maf and it still did it, replaced it and all is well now, I was missing about 50hp bc of it

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    Impounded
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    Ditch your cats.

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    Member Red99TA's Avatar
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    being that he lives in ca, prolly not a good idea

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    NY Representative basballny2's Avatar
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    Quote Originally Posted by ricefordiner View Post
    o and could having bad cats have an impact on gas mialege?
    yup, and also decrease hp, did the codes come back on?

  13. #13
    Impounded
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    Quote Originally Posted by IwishIhadanlt1 View Post
    being that he lives in ca, prolly not a good idea
    I just noticed he was from the nazi automotive state.

  14. #14
    Junior Member ricefordiner's Avatar
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    it came back on then off again. wow it robbed you pf that much horsepower! ill see if i can get my cats replaced under the warranty thing at the dealer.but its only on when i turn the key.

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    Junior Member ricefordiner's Avatar
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    my bad i didnt finish the sentence correctly, the service engine light is only on when the key is on the on position.

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    NY Representative basballny2's Avatar
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    Quote Originally Posted by ricefordiner View Post
    my bad i didnt finish the sentence correctly, the service engine light is only on when the key is on the on position.
    when you have it on accessory? Its always on then haha

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    Member Red99TA's Avatar
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    ya, your ses is always on if the ignition is in the on position car off, computer cant do all the checks without the engine running

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    Junior Member ricefordiner's Avatar
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    so what happens if the light isnt on!

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    Junior Member ricefordiner's Avatar
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    well i didnt know that it was suppose to be on when u turn the key but besides that i did have the chek engine light on when the car was on. anywayz the car is for some reason running better than it was when before i raced that night so i was trippn out cause thats just weird. But as soon as i get some cash im taking her to see if the cats suk ass.

  20. #20
    NY Representative basballny2's Avatar
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    Sometimes these things just happen and they clear themselves out. If the car is running fine and you dont have any check engine light on while the car is running then i wouldnt worry about it for now. But if the check engine light is on while the car is on accessory then you got some serious problems sorry i had to.

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