That steady check engine light on your 2022 Acura Integra paired with P0420 can trigger concern about expensive catalytic converter replacement. Before assuming the worst, understand that on a relatively new vehicle like yours, true catalyst failure is unlikely—other explanations deserve investigation first.
What P0420 Indicates
Code P0420 means the engine computer detected reduced catalytic converter efficiency. The system compares oxygen sensor readings before and after the catalyst—a functioning converter dramatically changes exhaust composition, showing much steadier downstream sensor readings than the fluctuating upstream sensor.
Why True Catalyst Failure Is Unlikely on a 2022
Modern catalytic converters typically last 150,000+ miles under normal conditions. On a 2022 Integra with relatively low mileage, actual catalyst degradation is uncommon. More likely causes include:
- Oxygen sensor problems - Downstream sensor becoming lazy or contaminated
- Exhaust leaks before the catalyst - Small leaks confuse sensor readings
- Engine running issues - Rich or lean conditions affect apparent efficiency
- Sensor or software calibration - May need update on newer vehicles
- Recent battery disconnect - Monitors may need to complete
Diagnostic Approach for 2022 Integra
- Check for additional codes indicating root causes
- Monitor both oxygen sensor waveforms and response times
- Verify fuel trims are within normal range
- Inspect for exhaust leaks before the converter
- Check for software updates or TSBs for the Integra
Federal Emissions Warranty
Federal law mandates 8-year/80,000-mile warranty coverage on catalytic converters. Your 2022 Integra is well within this period, so if the catalyst genuinely failed, dealer repair should be covered.
Repair Costs If Needed
- Oxygen sensor replacement: $200-$400
- Exhaust leak repair: $150-$400
- Software update: Often complimentary
- Catalytic converter (warranty): $0 if covered