Why did I get a P0546?
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This is a discussion on Why did I get a P0546? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; So why would I get a P0546 (high EGT)? I have a feeling but tell me if I'm right. Mods ...

  1. #1
    Registered User PKer's Avatar
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    Why did I get a P0546?

    So why would I get a P0546 (high EGT)?
    I have a feeling but tell me if I'm right. Mods are: gutted OE uppipe, catless turbo-back, Samco I/C hoses, and STi hoodscoop.

    OK here's my theory. When I put the STi scoop on I didn't reset the ECU. It was a cool night and I was cruising on the freeway in 5th I started going up a pretty steep grade but left it in 5th. Under a high load/boost situation, the ECU didn't compensate for the extra cool charge air and I ran lean.

    I didn't think the STi scoop would make a difference. Am I on target here?

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    Registered User CKxx's Avatar
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    Are you sure it wasnt "High Input?" Because that would signify a lower EGT, which is correct.
    I created my avatar.

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    cnk
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    Your EGT sensor in the uppipe is not reading correctly due to the catless uppipe. The fix is to disconnect the EGT sensor and put a 2.2kOHM 1/2W resistor in to the ECU side.

    Calvin

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    Registered User PKer's Avatar
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    Originally posted by CKxx
    Are you sure it wasnt "High Input?" Because that would signify a lower EGT, which is correct.
    Well according to the book it is "P0546 Exhaust Gas Temperature Sensor Circuit High (Bank 1)"

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    Registered User BlkWRXWag's Avatar
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    Seb,

    Your stock EGT probe in the uppipe has burnt thru - this happened to me as well. You need the EGT resistor mod - so simple even I was able to do it. For $1, it's worth a shot anyway!

    -Max.

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    Registered User AjIsDope's Avatar
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    Originally posted by cnk
    Your EGT sensor in the uppipe is not reading correctly due to the catless uppipe. The fix is to disconnect the EGT sensor and put a 2.2kOHM 1/2W resistor in to the ECU side.

    Calvin
    That's what I did and I have not had a problem thus far. PKer, I have some extra resistors lying around if you want to pick one up. I can even install it for you.
    03 Cobra
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    Registered User Wade-0's Avatar
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    Originally posted by BlkWRXWag
    Seb,

    Your stock EGT probe in the uppipe has burnt thru - this happened to me as well. You need the EGT resistor mod - so simple even I was able to do it. For $1, it's worth a shot anyway!
    And if you don't get it out of there soon, it could fall apart and destroy your turbo. Do the resistor mod ASAP and plug the EGT bung!

  9. #8
    Registered User BlkWRXWag's Avatar
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    Originally posted by Wade-0
    And if you don't get it out of there soon, it could fall apart and destroy your turbo. Do the resistor mod ASAP and plug the EGT bung!
    Really - I had not heard of that. Mine has been sitting in there burnt out for 11,000 miles!! Should I be very concerned?

  10. #9
    Registered User AjIsDope's Avatar
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    What size plug will fit in the EGT bung?

  11. #10
    Registered User Wade-0's Avatar
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    Originally posted by AjIsDope
    What size plug will fit in the EGT bung?
    EGT Bung replacement bolt size...

  12. #11
    Registered User AjIsDope's Avatar
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    Thanks

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    Registered User PKer's Avatar
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    So is it really is a false reading? I don't want to cruise around with no EGT sensor and not know if there is an actual problem.
    I don't have an EGT gauge and didn't plan on getting one anytime soon since I don't plan on upping the boost.

    I had a resistor on my old car since the Autospeed flex uppipe has no bung.

  14. #13
    Registered User AjIsDope's Avatar
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    Originally posted by AjIsDope
    PKer, I have some extra resistors lying around if you want to pick one up. I can even install it for you.

  15. #14
    Registered User PKer's Avatar
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    Aj: are you going to South Coast or Rallycross on Sat.?

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    Registered User AjIsDope's Avatar
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    Nah, I have to work. :-/

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