Pin 3: Diag Module

Code 4 - Air Injection System [AIR]faulty; Hot film Mass Air Flow Sensor
Code 6 - Idle Speed Control [ISC] faulty
Code 9 - Intake Air Temp [IAT] sensor open circuit

Check the harness in some key places to see if it's 'crumbling'

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Regards . . . . JimF
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'94 S500 Cpe

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