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Dear robertmfranklin,
Hope you're well. The state of the seats - motor(s) working, heater(s) working, etc. - will not affect the "Check Engine Light".
The "check engine light" comes on due to malfunctions/failures in engine/ignition-specific items, e.g., oxygen sensor, air-mass meter, ignition control unit (ICU), engine control unit (ECU), etc.
You'll need to read the On-Board Diagnostic (OBD) codes, to get an idea of the problem.
Please post your findings.
Hope this helps.
Yours faithfully,
Spook
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