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I replaced my throttle body unit, and the same thing is happening.....engine power reduced & service traction message. Codes read P0121, P0122, P1516, P2101, and P2135. Circuit range/performance, low input, correlation error, and voltage correlation. Autozone told me that the unit is faulty....a local garage told me I have to synchronize the computer and the unit. Any thoughts??
 
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