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P0420: Catalyst System Efficiency Below Threshold (Bank 1)
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Powertrain
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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)
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Phone Connection Keeps Dropping
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Home
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Bentley
Bentley
Bentley models with official NHTSA recalls, fault code help and maintenance guides.
Recall data
NHTSA (United States)
Market
United States and Europe
Bentley models
Arnage
Azure
Bentayga
Brooklands
Continental
Flying Spur
Mulsanne
Latest Bentley recalls
Bentley Bentayga recall: Equipment:other:labels
Equipment:other:labels · 2026-04-10
Bentley Bentayga recall: Equipment:other:labels
Equipment:other:labels · 2026-03-24
Bentley Bentayga recall: Seats
Seats · 2023-05-31
Bentley Bentayga recall: Back Over Prevention:display Function
Back Over Prevention:display Function · 2022-10-05
Bentley Bentayga recall: Seats
Seats · 2022-04-14
Bentley Bentayga recall: Electronic Stability Control (esc):control Module:software
Electronic Stability Control (esc):control Module:software · 2021-08-18
Explore Bentley
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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