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Are there conditions that cause a false po442 in a Buick's diagnostic test codes?
Wiki User
∙ 15y ago
PO442 is a Service Engine Error code can be caused by one of the following:
1. Defective or loose fuel cap
2. EVAP canister or hose cracked- not connected
3. Purge or vent solenoid defective
4. Vaccum leak at engine
Wiki User
∙ 15y ago
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