A8 Sedan V8-3.7L (AEW) (1997)
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Checking ignition coil secondary circuit
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Connect multimeter US 1119 (Fluke 83 or equivalent) and check for open circuit between 3-pin connector terminal 4A and engine Ground.
If all Ground connections are OK:
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Replace ignition coils.
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Generate readiness code, Refer "Monitors, trips and/or Drive Cycle (Readiness Code)/Generating, Readiness Code" See: Computers and Control
Systems/Testing and Inspection