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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
By System
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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OBD-II
Freeze Frame Data
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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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Home
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Isuzu
Isuzu
Isuzu models with official NHTSA recalls, fault code help and maintenance guides.
Recall data
NHTSA (United States)
Market
Models sold in the United States
Isuzu models
Ascender
Axiom
Hombre
i-280
i-290
i-350
i-370
Rodeo
Trooper
VehiCross
Explore Isuzu
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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