Volvo XC60
P0421
The P0421 code indicates "Warm Up Catalyst Efficiency Below Threshold (Bank 1)" for a 2017-present Volvo XC60 (536). This suggests an issue with the catalytic converter's efficiency, which may affect emissions and engine performance.
4 SolutionsP-CodePowertrain
P
Error Code Type
Powertrain
Components
1 affected
Exhaust System
Symptoms
10 common
- •Check engine light illuminated
- •Decreased fuel efficiency
- •Rough engine idle
- +7 more
Most Affected Generations
2 generations
SPA
3
536
1
Top Affected Components
1 component
Exhaust System
4
Severity Levels
1 level
medium
4
Quick Facts
4
Total Solutions
1
Affected Components
10
Common Symptoms
2
Generations
All Solutions
Showing 4 of 4 solutions for error code P0421 across all generations.