What Does P0420 Mean on a 2022 Acura Integra?
A P0420 code on your 2022 Acura Integra means the ECM has detected that the catalytic converter isn't operating at full efficiency. The revived Integra is powered by a 1.5L VTEC turbocharged four-cylinder engine producing 200 horsepower (or 200 hp with the CVT and 200 hp with the 6-speed manual in standard trim). As an inline-four, there's a single exhaust bank, making P0420 the only possible catalyst efficiency code.
The Integra shares its powertrain with the Honda Civic, so there's a wealth of diagnostic knowledge available. Let's explore what's likely happening.
Symptoms
- Check engine light on — The primary sign
- Marginal MPG decrease — Possibly 1-2 MPG
- Faint sulfur smell — From the exhaust
- Normal performance — The Integra should drive fine
- Emissions test failure — In testing states
Common Causes on the 2022 Integra
1. Downstream O2 Sensor Issue
The 1.5L turbo engine's exhaust system runs hot due to the turbocharger, and the downstream O2 sensor can fail or become contaminated prematurely. On the Integra, the close-coupled catalytic converter is positioned right after the turbo, putting the O2 sensor in a high-temperature environment. A faulty sensor produces incorrect readings that trigger P0420.
2. PCM Software Calibration
As the first year of the revived Integra, software calibrations may still be undergoing refinement. Honda/Acura frequently releases updates that adjust catalyst monitoring parameters. A PCM reflash could resolve the code without any parts replacement.
3. Catalytic Converter Defect
The turbo engine's close-coupled converter operates at very high temperatures. A manufacturing defect in the catalyst coating or substrate can cause early underperformance. Being a first-year model makes this a possibility worth investigating under warranty.
4. Exhaust Leak Near Turbo
The turbo-to-downpipe connection and downpipe-to-converter connections are potential leak points. A small exhaust leak introduces air near the O2 sensor, causing false readings that mimic a failed converter.
Diagnostic Steps
- TSB search — Critical for a first-year model. Your dealer should check for known issues.
- Complete code scan — Look for companion codes that reveal additional information.
- O2 sensor analysis — Compare upstream and downstream sensor waveforms.
- Exhaust inspection — Check turbo connections and converter flanges for leaks.
Repair Costs
- O2 sensor replacement: $120 – $270 (parts and labor)
- Software update: $0 – $150
- Catalytic converter: $900 – $1,800
- Exhaust leak repair: $100 – $350
Safe to Drive?
Yes, your 2022 Integra is safe to drive with P0420. The code doesn't affect handling, safety, or the fun-to-drive character that makes the Integra special. Since the 2022 model is under warranty, schedule a dealer appointment for a likely free repair.
Prevention
- Use premium fuel — The turbo engine performs best with premium gasoline
- Follow Acura's maintenance schedule — Consistent service prevents converter issues
- Fix engine codes quickly — Small problems can damage the converter
- Avoid aggressive cold-start driving — Let the engine warm up before pushing it hard