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  1. TJ Wrangler Technical Forum
    My TJ had a rough idle and low mpg for about a month with no code. I changed the spark plugs and that did not fix anything. Plugs 4-6 were dirty when I changed them. Once I drove the Jeep on the highway for about 45 min I got a flashing check engine light. The light came on for P0174 and P0306...
    false reading lean oxygen sensor p0174 p0306
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