What Does P2424 Mean?
The hydrocarbon (HC) adsorption catalyst on Bank 2 is not performing efficiently enough to meet emissions standards. This catalyst traps unburned hydrocarbons during cold starts until the main catalytic converter reaches operating temperature.
Common Causes
45%
Saturated or degraded HC adsorption catalyst
25%
Exhaust leaks upstream of catalyst affecting readings
20%
Faulty oxygen sensor providing incorrect feedback
10%
Engine running rich causing catalyst overload
Diagnostic Steps
1
Step 1: Inspect exhaust system for leaks between engine and Bank 2 catalyst
2
Step 2: Check oxygen sensor data for Bank 2 to verify proper operation and fuel trim values
3
Step 3: Perform catalyst efficiency test using upstream/downstream O2 sensor comparison
4
Step 4: Inspect HC adsorption catalyst for physical damage or contamination
5
Step 5: Verify proper engine operation (no misfires, correct fuel mixture)
Estimated Repair Cost
$400 - $1,500
Parts + labor, varies by vehicle and location
The hydrocarbon (HC) adsorption catalyst on Bank 2 is not performing efficiently enough to meet emissions standards. This catalyst traps unburned hydrocarbons during cold starts until the main catalytic converter reaches operating temperature.
The most common cause of P2424 (HC Adsorption Catalyst Efficiency Below Threshold Bank 2) is: Saturated or degraded HC adsorption catalyst
Typical repair costs for P2424 range from $400 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but may fail emissions testing. Prolonged driving may damage main catalytic converter.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2424 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
