Toyota Highlander
P0420
The vehicle is exhibiting a P0420 code, which indicates that the catalytic converter's efficiency is below the threshold set by the manufacturer, specifically in a 2020-present Toyota Highlander (Fourth Generation).
60 SolutionsP-CodePowertrain
P
Error Code Type
Powertrain
Components
2 affected
Exhaust SystemEngine
Symptoms
10 common
- •Check engine light illuminated
- •Decreased fuel efficiency
- •Poor engine performance (e.g., sluggish acceleration)
- +7 more
Most Affected Generations
1 generation
XU70
60
Top Affected Components
2 components
Exhaust System
56
Engine
4
Severity Levels
2 levels
high
42
medium
18
Quick Facts
346
Total Solutions
2
Affected Components
10
Common Symptoms
1
Generations
All Solutions
Showing 60 of 346 solutions for error code P0420 across all generations.