strange Check Engine Light issue
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This is a discussion on strange Check Engine Light issue within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hi all: I need some help from you guys. Few days ago I got a Check Engine light on my ...

  1. #1
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    Unhappy strange Check Engine Light issue

    Hi all:
    I need some help from you guys. Few days ago I got a Check Engine light on my 2007 WRX TR. When I took to a mechanic he said coolant issue. The gauge on the dashboard displays hot when idle while the ECU says its cold and it starts revving up. Our first guess was coolant or coolant sensor issue. He replaced both and we are still seeing the same issue. He is now saying it could be ECU problem itself. He is just taking guesses. The car is unusable at the moment.

    Any ideas what could be wrong? or anyone run into similar issues?

    Thanks
    Chetan

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    He simply abides. SD_GR's Avatar
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    P0118

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    CEL P0118...how to fix? - NASIOC

    Try this if the link works

  6. #5
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    Here is the verdict. I towed it to the dealer. It was really strange. He changed the coolant sensor and still seeing that ECU read cold and guage read hot. it was losing power. He then bled the coolant and then it started holding up. I took it back today, it drives fine and no loss of power. He mentioned if this happens again we might need to replace the ECM.

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