What do my 1990 Ford Mustang 5.0 LX Check Engine Codes mean?

acalex1967

New member
Here are the codes:

34:EGR Valve Position/Pressure Feedback EGR Voltage Above Closed Limit (O,R), PFE or EVP circuit has intermittently failed above the closed limit of 0.67 volts (CM)

67: Park Neutral Position Switch Circuit Open; A/C On -Manual (O), Manual Lever Position Sensor Out Of Range/A/C On (CM,O), Clutch Switch Circuit Failure (CM)

And 85: CANP Circuit Failure (O)

Anyway, thats all well and good. Now can someone please tell me what that means and what I have to replace??

Thanks
 
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