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Service Engine Soon Light On ???"s

This is a discussion on Service Engine Soon Light On ???"s within the General Help forums, part of the LSx Technical Help Section category; I have a 2001 Camaro Z28 with 91K miles on it,the only mods on it are K&N filter,SLP air lid,SLP ...

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    Unhappy Service Engine Soon Light On ???"s

    I have a 2001 Camaro Z28 with 91K miles on it,the only mods on it are K&N filter,SLP air lid,SLP MAF sensor and SLP cat back exhaust,I was driving the car the other day and the Service Engine Soon light came on and I went to Advance Auto and checked the light and the codes P0171 bank 1 too lean and P0174 bank 2 too lean was given,what do these codes means and which bank is which?THANKS

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    Moderator 98TransAmWs-6's Avatar
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    Have you had a tune for the SLP MAF? If not that could be the cause since it is much larger than the stock MAF plus aftermarket units usually need a good tune to work properly and even then they sometimes don't. I actually would ditch the slp MAF and either go back to the factory one or get a SD tune to get rid of the MAF all together. You could also clean your MAF and see if that helps. I would also check you O2 sensors.

    The codes mean that you car has detected a lean condition on each side of the car. I believe bank one is the drivers and bank two is the passengers iirc. This means there is too much air and not enough fuel coming in, that us why I mentioned the tune. A lean condition can cause engine detonation. Damaged O2s can cause a false code though.
    Last edited by 98TransAmWs-6; 06-30-2012 at 12:24 PM.
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    Senior Member Naaman's Avatar
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    Will is correct. Generally speaking, the O2 sensor is responsible for "reporting" the lean condition to the PCM. The PCM will try to correct for this, but only within certain parameters. If the O2 sensors are reporting a false lean condition, then the problem could be with the O2 sensors themselves, or with the MAF, if it is reporting less air than it is actually taking in to the PCM.

    As it happens, the MAF's inputs are given top priority by the PCM, so if it is "lying," everything else will be skewed.

    I don't necessarily agree with getting it tuned out, but a tune to account for the "upgrade" could definitely fix the problem, if the PCM is misinterpreting the SLP's MAF readings.

    Given that both banks are showing lean, rather than individual cylinders, I would check the MAF first (clean it with some MAF cleaner), then clear the codes and see if they come back. If they do, you may need a tune. If a tune doesn't fix it, both your front O2 sensors may be bad.

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    None Shall Pass Knight's Avatar
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    Agree with Naaman. A GM MAF is highly recommended, as aftermarket ones tend to cause problems. Also, swap out the K&N filter for a paper one. The oil on the filter will get on the MAF's sensors, causing problems as well.

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    Senior Member Naaman's Avatar
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    Everytime I remember that I've got a K&N type filter, I consider changing it back to a paper one.... They are a PITA to maintain.

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    Quote Originally Posted by Naaman View Post
    Everytime I remember that I've got a K&N type filter, I consider changing it back to a paper one.... They are a PITA to maintain.
    I have had the car tuned with the SLP MAF sensor on it, I will try to clean the MAF sensor and see what happens,how do I CLEAR the codes after I clean the MAF sensor?THANKS

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    Former Mopar Man 2002ssslp's Avatar
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    I think it's the O2 sensors. I have a SLP MAF and when the engine is cold and I give it more then 1/2 throttle the SES light will come on. The code id for MAF not lean banks. After a drive cycle the SES light will go out by itself. It happens so often I do not even reset it anymore.
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    How do I reset the SES light?THANKS

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    Member Redrokit8's Avatar
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    Quote Originally Posted by Naaman View Post
    Everytime I remember that I've got a K&N type filter, I consider changing it back to a paper one.... They are a PITA to maintain.
    Yep, I agree. Sooner or later the MAF will get a slight build up on it's surface that you might not be even able to see with a casual look. There's just no way you can avoid a build up with an oil charged filter. CRC the MAF and the Throttle Body but more importantly send it to Frost whether the light goes out or not.
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    Senior Member Naaman's Avatar
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    Quote Originally Posted by dickeymoore View Post
    How do I reset the SES light?THANKS
    Take it to autozone and hook up the scanner. The scanner will have the option to delete the codes.
    Last edited by Naaman; 07-02-2012 at 12:55 PM.

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