Tesla Model Y
P0421
The P0421 code in a Tesla Model Y (2020-present) indicates that the engine control module (ECM) has detected an issue with the warm-up catalytic converter's efficiency below the threshold.
2 SolutionsP-CodePowertrain
P
Error Code Type
Powertrain
Components
1 affected
Exhaust System
Symptoms
8 common
- •Check engine light illuminated
- •Decreased fuel efficiency
- •Engine stalling or rough idle
- +5 more
Most Affected Generations
1 generation
Current
2
Top Affected Components
1 component
Exhaust System
2
Severity Levels
2 levels
high
1
medium
1
Quick Facts
2
Total Solutions
1
Affected Components
8
Common Symptoms
1
Generations
All Solutions
Showing 2 of 2 solutions for error code P0421 across all generations.