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Auto zone hooked up Thier machine and found 4 codes
Vehicle: 1998 ford windstar 3.8L

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P0340 Camshaft position sensor circuit malfunction

P0153 02 sensor circuit slow response Bank 2 Sensor 1

P0174 System too lean Bank 2

P1450 Excessive fuel tank vacuum

Do vacuum leak check, especially at the purge hose , if there is no problem found in that area, you would need to do a KOER (Key on engine running test)

​ In the back of the intake manifold area, you need to make sure the EVAP hose are connected, to its vacuum source

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