P2422 Buick Evaporative Emission (EVAP) System Vent Valve Stuck Closed

P2423 Buick HC Adsorption Catalyst Efficiency Below Threshold (Bank 1)

OBD Code:
System:
Subsystem: 		 P2423 Buick – (ASE)
 Powertrain
 Auxiliary Emission Controls

Trouble Code Description: HC Adsorption Catalyst Efficiency Below Threshold (Bank 1)


Location:
Analysis:

Possible Causes:
 Bank 1
 

 

Tech description:

Buick Vehicle:Buick Regal – ?Buick Riviera – ?Buick LaCrosse – ?David Dunbar Buick – Buick Century – Buick LaCrosse – Buick LeSabre – Buick Lucerne – Buick Park Avenue – Buick Regal – Buick Verano – Buick Enclave – Buick Encore – Buick Rainier – Buick Rendezvous – Buick Terraza – Buick Riviera