P0131 on Your 2022 Acura Integra
Code P0131 on your 2022 Acura Integra indicates the Bank 1 Sensor 1 air-fuel ratio sensor is reading below its expected voltage. The revived Integra uses a 1.5L turbocharged four-cylinder engine (L15CA) producing 200 hp (or 200 hp with the CVT, and 200 hp with the 6-speed manual). As an inline-four, there's only one bank — Bank 1 Sensor 1 is the upstream wideband A/F sensor located between the turbo outlet and the catalytic converter.
Symptoms
- Check engine light on
- Reduced fuel economy below the expected 30-33 MPG combined
- Subtle rough idle
- Mild hesitation during acceleration
- Slightly less crisp throttle response than normal
Why Your Integra Has P0131
1. A/F Sensor Failure
The Integra's 1.5L turbo produces elevated exhaust temperatures downstream of the turbocharger, stressing the wideband A/F sensor. The Denso sensor's pumping cell can degrade from thermal cycling or become contaminated by oil vapors from the PCV system. On early-production 2022 models, sensor quality variations may also contribute to premature failure.
2. Wiring or Connector Problems
The Integra shares its platform with the Honda Civic, and the compact engine bay puts the sensor harness close to the turbo and exhaust. Heat damage to wire insulation, a connector not fully seated, or corrosion from road salt can cause signal voltage issues.
3. Exhaust Leak at Turbo Connection
The turbo-to-downpipe gasket and the flex pipe are common leak points on the 1.5T platform. A small leak introduces ambient air past the A/F sensor, causing a false lean reading.
4. Boost System Leak
A loose charge pipe clamp, cracked intercooler boot, or failing bypass valve can allow unmetered air into the engine, creating a genuine lean condition. P0171 alongside P0131 confirms this.
Diagnostic Steps
- Scan all codes — check for P0171 companion code.
- Monitor A/F sensor data. Pump current should respond to throttle changes.
- Inspect the sensor connector near the turbo for heat damage.
- Check turbo-to-downpipe and flex pipe for leaks.
- If fuel trims are highly positive, pressure-test the boost system.
- Replace with a genuine Denso A/F sensor if confirmed faulty.
Repair Costs
Genuine Denso A/F sensor: $100–$250. Acura dealer labor: $80–$180. Total: $180–$430. Aftermarket sensors from NTK are available at $60–$150. The 2022 Integra is under the 4-year/50,000-mile basic warranty and 8-year/80,000-mile emissions warranty.
Priority
Fix within two weeks. The Integra's turbo engine relies on accurate A/F sensor feedback. Under warranty, this is a free repair — no reason to delay.