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Hello Mr. Scotty i have my trailblazer 2009 240000 miles today at start i heared knocks from engine and intermittent noise from exhaust check engine light flashing on off many times what could be the problem?
i changed engine oil 48 hours back i soil is bad , keeping in mind that check engine light was on one day and off the other day P0171 code was there now also liquid drops comes out from the tailpipe