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P0420: Catalyst System Efficiency Below Threshold (Bank 1)
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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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Rivian
Rivian
Rivian models with official NHTSA recalls, fault code help and maintenance guides.
Recall data
NHTSA (United States)
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Models sold in the United States
Rivian models
R1S
R1T
R2
Latest Rivian recalls
Rivian R1S recall: Exterior Lighting:headlights
Exterior Lighting:headlights · 2025-02-13
Rivian R1S recall: Electrical System:software
Electrical System:software · 2024-11-01
Rivian R1S recall: Vehicle Speed Control:cruise Control
Vehicle Speed Control:cruise Control · 2024-09-13
Rivian R1S recall: Exterior Lighting:back Up Lights
Exterior Lighting:back Up Lights · 2023-03-31
Rivian R1S recall: Air Bags:side/window:curtain
Air Bags:side/window:curtain · 2023-03-09
Rivian R1S recall: Exterior Lighting:turn Signal
Exterior Lighting:turn Signal · 2026-08-06
Explore Rivian
Fault codes
See all
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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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