Engine-Codes - Generic - P2423

P2423 Code - HC Adsorption Catalyst Efficiency Below Threshold Bank 1

- Code Popularity: 37,724 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P2423?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Hydro Carbon (HC) adsorption catalyst (under floor)
  • Exhaust tube
  • Intake air leaks
  • Faulty Fuel injector
  • Fuel injector leaks
  • Faulty Spark plug
  • Improper ignition timing
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How to Fix the DTC P2423?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P2423 code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the P2423 Code Mean?

The Engine Control Module (ECM) monitors the phase gap between heated oxygen sensor 2 signal and heated oxygen sensor 3 signal.
The phase gap between heated oxygen sensor 2 signal and heated oxygen sensor 3 signal becomes small as the Hydro Carbon (HC) adsorption catalyst (under floor) is deteriorated.
When the phase gap between heated oxygen sensor 2 signal and heated oxygen sensor 3 signal approaches a specified limit value, the HC adsorption catalyst (under floor) malfunction is diagnosed.

P2423 Code - HC Adsorption Catalyst Efficiency Below Threshold Bank 1

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Code P2423 Information for Specific Makes

  • P2423 Dodge HC Adsorption Catalyst Efficiency Below Threshold Bank 1
  • P2423 Infiniti HC Adsorption Catalyst Efficiency Below Threshold Bank 1
  • P2423 Lexus HC Adsorption Catalyst Efficiency Below Threshold Bank 1  📷
  • P2423 Nissan HC Adsorption Catalyst Efficiency Below Threshold Bank 1
  • P2423 Scion HC Adsorption Catalyst Efficiency Below Threshold Bank 1  📷
  • P2423 Toyota HC Adsorption Catalyst Efficiency Below Threshold Bank 1  📷

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