Pulled the following codes off my 95 Mystique 2.5L atx today (EEC-IV):
172 Heated Exhaust Gas Oxygen (HEGO) sensor - voltage signal indicates "lean" (Bank #1)
538 - Insufficient RPM change during dynamic response test (engine run self-test) or invalid cylinder balance test - throttle position movement or invalid cylinder balance test - cylinder identification problems.
Well, that narrows it down???
Any one had a throttle position sensor go bad? What are the symptoms?
Thanks,
