Car is a 2002 Trailblazer. Engine periodically knocks when 2004 Trailblazer Wiring Schematic. Diagrams. Wiring I Have 2002 Chevrolet Trailblazer 4.2.i Have Code P1221 I have a 2003 Chevy Trailblazer LS 6 cylinder. My Check 2002 Chevy Trailblazer Engine Diagram

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