P0430
Catalyst System Efficiency Below Threshold (Bank 2)
Description
Catalyst System Efficiency Below Threshold (Bank 2). This powertrain diagnostic trouble code covers the engine, the fuel and ignition systems, emission control and the transmission.
OBD Codes Details
Possible Causes
Failed catalytic converter, leaking EVAP hoses or purge valve, clogged EGR passages, faulty oxygen sensor
Solution
Check upstream and downstream oxygen sensor readings, smoke-test the EVAP system, inspect the EGR passages and valve, evaluate catalyst efficiency
Symptoms
- Reduced fuel efficiency
- Strong exhaust odor
- Engine may run slightly rougher
- Check engine light illuminated
- Failed emissions test
Diagnostic Recommendations
- Test catalytic converter efficiency on bank 2 using OBD data
- Check oxygen sensors upstream and downstream of the bank 2 catalyst
- Inspect exhaust system for leaks before the bank 2 catalyst
- Test engine compression and fuel trim values on bank 2
- Verify proper engine operation without other codes present
Repair Cost Estimate
- Oxygen sensor replacement: $200-500
- Catalytic converter replacement: $800-2500
- Exhaust system repair: $200-600
- Engine tune-up: $200-500
- Total diagnostic and repair: $500-4000
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Fact-checking completed
Verified by:
Pavel Volkov
Created:
Information verified against official sources
Official Sources
Society of Automotive Engineers
Official OBD-II diagnostic trouble codes standard (SAE J2012)
Automotive engineering standards organization
International Organization for Standardization
International standard for vehicle diagnostic systems
International standards for automotive diagnostics
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