Club4G Forum : Mitsubishi Eclipse 4G Forums - 2006-2012 Eclipse Authority - View Single Post - Tune vs DEQ
Thread: Tune vs DEQ
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Old March 7th, 2019, 11:24 PM   #2 (permalink)
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Name: Kyle
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Those codes mean your bottom O2 sensors are not seeing enough dirty exhaust/activity

Do you have O2 spacers on them? Are they old? You don't have cats in the manifolds from the RRE headers? And you have O2 spacers? Try drilling the holes in the spacers a little bigger so that the bottom sensors see a little more exhaust.
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