P0131 on the 2024 Acura TLX
Your 2024 Acura TLX has triggered P0131, meaning the Bank 1 Sensor 1 air-fuel ratio sensor is reading below the ECM's expected voltage range. The 2024 TLX continues with the 2.0L turbo four-cylinder (K20C6) on standard models and the 3.0L twin-turbo V6 (KA-J30AB) on the Type S. On the four-cylinder, there's one bank. On the V6, Bank 1 is the rear bank. Both use Denso wideband A/F sensors.
Symptoms
- Check engine light on
- Slightly lower fuel economy
- Minor idle roughness
- Subtle acceleration hesitation
- No safety concern
Likely Causes
1. Factory-Defective Sensor
On a 2024 model, a manufacturing defect in the Denso A/F sensor is the most probable cause. Turbo engines stress sensors more than naturally aspirated ones, making defects apparent sooner. The Type S twin-turbo V6 produces even higher exhaust temperatures.
2. Assembly Wiring Issue
Connector not fully seated, harness pinched during installation, or improper routing near turbo components are assembly-related issues on a new vehicle.
3. Exhaust Connection Leak
Factory gasket or torque issues at the turbo-to-downpipe connection can introduce air past the sensor. The tight packaging of the TLX engine bay means multiple exhaust connections in close proximity.
4. Software Update
ECM calibration refinements may be available via TSB that address A/F sensor monitoring on the TLX platform.
What to Do
- Schedule an Acura dealer appointment — full warranty applies.
- Dealer will use HDS for comprehensive sensor diagnostics.
- Ask about applicable TSBs.
- Avoid DIY repairs on a vehicle under warranty.
Repair Costs
Fully covered under the 4-year/50,000-mile basic warranty and 8-year/80,000-mile emissions warranty. Out of pocket if needed: $220–$520.
Summary
Take your 2024 TLX to the dealer for a free warranty repair. This is a minor sensor issue easily resolved within a single appointment.