Toyota Highlander
P0420
The P0420 code indicates a malfunction in the catalytic converter efficiency on a 2014-2019 Toyota Highlander, suggesting that the catalytic converter may not be functioning properly.
46 SolutionsP-CodePowertrain
P
Error Code Type
Powertrain
Components
8 affected
Exhaust SystemElectricalCatalytic Converter, O2 Sensors+5
Symptoms
10 common
- •Check engine light illuminated
- •Decreased engine performance
- •Poor fuel economy
- +7 more
Most Affected Generations
2 generations
XU50
34
XU70
12
Top Affected Components
5 components
Exhaust System
33
catalytic converter
6
Catalytic Converter
2
Electrical
1
Catalytic Converter, O2 Sensors
1
Severity Levels
2 levels
high
26
medium
20
Quick Facts
346
Total Solutions
8
Affected Components
10
Common Symptoms
2
Generations
All Solutions
Showing 46 of 346 solutions for error code P0420 across all generations.