Question about 1999 Chevrolet Silverado 1500
Po440 is emission control system malfunction, Probable Causes:
a) Defective or loose fuel cap
b) EVAP Canister or hose cracked- not connected
c) Purge or vent solenoid defective
d) Vacuum leak at engine.
Posted on Jul 21, 2010
Testimonial: "Thank You very much for the info. I will try all 4 of the solutions. You have a great day Bill"
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Posted on Jan 02, 2017
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