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cel codes 0174 & 0456

  1. Cel

    I have an 2008 Sequoia Plat with 108,000 miles. Had just the Check Engine light come on. Went to get the codes read and they were 0174 and 0456. I was looking for the cheapest and easiest things to fix first. I didn't want to start buying new O2 sensors right off the bat. I sprayed carb cleaner...