P0423 - Heated Catalyst Efficiency Below Threshold Bank 1
P0423 is a generic powertrain diagnostic trouble code indicating Heated Catalyst Efficiency Below Threshold Bank 1. It relates to the Auxiliary Emission Controls system.
DTC Breakdown (SAE J2012)
| System | Powertrain (P) |
| Type | Generic |
| Subsystem | Auxiliary Emission Controls |
| Fault Index | 23 |
| Standard | SAE J2012 / ISO 15031-6 |
What does diagnostic code P0423 mean?
The dtc/">diagnostic trouble code P0423 represents Heated Catalyst Efficiency Below Threshold Bank 1. This standard generic code points to a monitored fault condition in the vehicle's Powertrain network.
Detailed diagnostic guides and specific fix procedures for code P0423 are currently being compiled. Always verify check engine warnings with a qualified mechanic.
Frequently Asked Questions about P0423
What does P0423 mean?
The diagnostic trouble code P0423 represents Heated Catalyst Efficiency Below Threshold Bank 1. This standard generic code points to a monitored fault condition in the vehicle's Powertrain network.
What is the system for P0423?
The P0423 code is located in the vehicle's Powertrain network.