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P0420: Catalyst System Efficiency Below Threshold (Bank 1)
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P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
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Fault Codes
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Powertrain
Body
Chassis
Network
Common Codes
P0420: Catalyst System Efficiency Below Threshold (Bank 1)
P0300: Random/Multiple Cylinder Misfire Detected
P0171: System Too Lean (Bank 1)
P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
Learn
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Stop When It Is Safe
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Have It Checked Soon
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Phone Connection Keeps Dropping
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Mercury
Mercury
Mercury models with official NHTSA recalls, fault code help and maintenance guides.
Recall data
NHTSA (United States)
Market
Models sold in the United States
Mercury models
Cougar
Grand Marquis
Marauder
Mariner
Milan
Montego
Monterey
Mountaineer
Mystique
Sable
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Explore Mercury
Fault codes
See all
→
P0420
Catalyst System Efficiency Below Threshold (Bank 1)
P0300
Random/Multiple Cylinder Misfire Detected
P0171
System Too Lean (Bank 1)
P0128
Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
U0100
Lost Communication With ECM/PCM “A”
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How To Check Engine Oil
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How To Replace The Cabin (Pollen) Filter
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