P0131 on the 2024 Acura RDX
Your 2024 Acura RDX has set code P0131, meaning the Bank 1 Sensor 1 air-fuel ratio sensor is reading below the ECM's expected voltage. The 2024 RDX continues with the proven 2.0L turbocharged four-cylinder (K20C2) producing 272 hp. As an inline-four, there's only one bank — Bank 1 Sensor 1 is the upstream wideband A/F sensor between the turbo and catalytic converter.
What You May Notice
- Check engine light on
- Slightly lower fuel economy
- Minor idle roughness
- Subtle hesitation during light acceleration
- No immediate drivability emergency
Likely Causes
1. Defective A/F Sensor
On a 2024 model, a factory-defective sensor is the most probable cause. The Denso wideband A/F sensor can have manufacturing variations in its pumping cell or heater circuit that lead to early failure. The 2.0L turbo's high exhaust temperatures downstream of the turbocharger make sensor defects more apparent sooner.
2. Wiring or Assembly Defect
A connector not fully seated, a wire pinched during assembly, or routing too close to the turbo housing are assembly-related issues that appear in early vehicle life. The RDX's compact engine bay means the sensor harness navigates a tight space.
3. Exhaust Leak
A factory gasket defect or improperly torqued connection at the turbo outlet or downpipe can cause a small exhaust leak near the A/F sensor. This introduces air that reads as a lean condition.
4. Software Calibration Issue
The RDX's ECM may have software updates available that refine A/F sensor monitoring thresholds. Acura dealers have access to the latest HDS software and TSBs.
What to Do
- Schedule an Acura dealer appointment — this is a warranty repair.
- The dealer will use HDS for detailed sensor diagnostics.
- Ask about applicable TSBs for P0131.
- Avoid DIY repairs that could affect warranty coverage.
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–$480 for sensor replacement.
Bottom Line
A 2024 RDX with P0131 should go straight to the dealer. It's a free warranty repair that protects your catalytic converter and preserves the turbo engine's performance. Most dealers handle this within a single appointment.