P2424 - HC Adsorption Catalyst Efficiency Below Threshold Bank 2
The P2424 code indicates that the hydrocarbon (HC) adsorption catalyst on Bank 2 is operating below its expected efficiency threshold. This catalyst is part of the evaporative emission control system, designed to trap fuel vapors during cold starts and release them to the engine for combustion once warmed up. When efficiency drops, it may fail to capture hydrocarbons, leading to increased emissions and potential failure of emissions tests.
01. Most Common Causes
- Faulty HC adsorption catalyst
- Exhaust leak near the catalyst
- Engine misfire causing excessive hydrocarbons
- Faulty oxygen sensor (Bank 2 Sensor 1 or 2)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Failed emissions test
- Possible rough idle or hesitation
- Decreased fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect exhaust system for leaks near the HC catalyst.
Step 3: Check oxygen sensor readings for Bank 2 to ensure proper operation.
Step 4: Perform a smoke test to detect evaporative system leaks.
Step 5: If no leaks found, replace the HC adsorption catalyst.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but it may cause increased emissions and could fail an emissions test. It's best to diagnose and repair promptly.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Replacing the HC catalyst can range from $200-$600 depending on vehicle make and labor.