Check Engine Light (P0420) and reduced fuel economy on my 2024 Integra Technology

ClearTheCode admin answer:

1. Verify OBD-II Code: The P0420 code specifically indicates that the catalytic converter is not operating efficiently. While it often points to a failing catalytic converter, other issues can trigger it.
2. Check for Exhaust Leaks: An exhaust leak before or near the oxygen sensors can cause inaccurate readings, tricking the ECU into thinking the catalyst is inefficient. Listen for hissing sounds or inspect the exhaust system.
3. Inspect Oxygen Sensors: Faulty upstream or downstream oxygen (O2) sensors can also cause a P0420 code. The downstream sensor monitors the catalyst's efficiency. A professional diagnostic tool can monitor O2 sensor readings in real-time.
4. Fuel System Issues: Problems like a faulty mass airflow (MAF) sensor, leaky fuel injectors, or a bad engine coolant temperature sensor can cause the engine to run rich or lean, eventually affecting catalyst efficiency.
5. Spark Plugs/Ignition System: Misfires can send unburnt fuel into the exhaust, damaging the catalytic converter over time. While P0420 doesn't directly indicate misfires, it's worth considering if you have other symptoms.

Common Causes for P0420:

• Degraded or failing catalytic converter.
• Faulty downstream oxygen sensor.
• Exhaust system leaks.
• Engine running too rich or too lean due to other sensor failures.

When to See a Shop: It's important to address a P0420 code promptly. While your 2024 Acura Integra Technology might still drive, a failing catalytic converter can significantly impact performance, fuel economy, and emissions. Prolonged driving with this issue can also lead to more severe engine damage. An Acura dealership or a trusted independent shop with advanced diagnostic equipment can accurately pinpoint the root cause and recommend the appropriate repair, which could range from O2 sensor replacement to catalytic converter replacement.