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P0320 Ignition/Distributor Engine Speed Input Circuit Malfunction. Crankshaft position sensor, wiring, or pcm problem. Check the sensor and tone wheel on the crankshaft, and wiring to the sensor. There is a 2 pin connector down near the CPS, it gets corroded down there, remove the CPS and unplug, clean and pack with a dielectric grease ( seals water out).

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Q: 2004 navigator p0320 code
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