P2423 Possible Causes
- Hydrocarbon (HC) Adsorption Catalyst (underfloor)
- Exhaust pipe
- Intake air leaks
- Faulty fuel injector
- Leaking fuel injector
- Faulty spark plug
- Incorrect ignition timing
How to Fix Code P2423
Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
P2423 Symptoms
Possible
Engine light on (or service engine soon warning light)
P2423 Meaning
The Engine Control Module (ECM) monitors the phase difference between the Heated Oxygen Sensor 2 signal and the Heated Oxygen Sensor 3 signal.
The phase difference between the Heated Oxygen Sensor 2 signal and the Heated Oxygen Sensor 3 signal becomes small as the Hydro Carbon (HC) Adsorption Catalyst (underfloor) deteriorates.
When the phase difference between the Heated Oxygen Sensor 2 signal and the Heated Oxygen Sensor 3 signal approaches a specified limit value, the malfunction of the HC Adsorption Catalyst (underfloor) is diagnosed.