Operation CHARM
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Mercury
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1987
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Topaz AWD L4-140 2.3L HSC
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Repair and Diagnosis
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Powertrain Management
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Computers and Control Systems
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Testing and Inspection
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Pinpoint Tests
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DN - EGR Valve Position Sensor (EVP)/EGR Valve Regulator (EVR)
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DN91 - DN92
DN91 - DN92
*** UPDATED BY TSB #8918A9
