P0131 on the Redesigned 2024 Buick Enclave
Your 2024 Buick Enclave has triggered code P0131, meaning the Bank 1 Sensor 1 oxygen sensor is reading below the ECM's expected voltage. The completely redesigned 2024 Enclave moves to the GM E2 platform and is powered by a 2.5L turbocharged four-cylinder engine producing 328 hp — a significant departure from the previous generation's 3.6L V6. As an inline-four, there's only one bank. Bank 1 Sensor 1 is the upstream O2 sensor between the turbo outlet and the catalytic converter.
Symptoms
- Check engine light on
- Slightly reduced fuel economy
- Subtle idle roughness
- Minor hesitation during acceleration
- No immediate safety issue
Causes on the 2024 Enclave
1. O2 Sensor Defect
On a brand-new redesigned vehicle, a factory-defective sensor is the most likely cause. The 2.5L turbo engine produces higher exhaust temperatures than the previous naturally aspirated V6, putting more stress on the upstream sensor. First-year production of a new powertrain can also see higher rates of individual component issues.
2. Assembly Wiring Issue
The all-new E2 platform is in its first year of production. Assembly-related wiring issues — connector not fully seated, harness pinched near the turbo, or routing errors — are possible on early-production units.
3. Exhaust Leak
A factory gasket defect at the turbo-to-downpipe or downpipe-to-midpipe connection can introduce air past the O2 sensor. New platform exhaust systems need proper gasket sealing from day one.
4. ECM Software Refinement
First-year vehicles on a new platform often receive ECM software updates. GM may issue a TSB addressing P0131 with a calibration update for the new 2.5L turbo.
What to Do
- Schedule a Buick dealer appointment — full warranty coverage applies.
- The dealer will use GM's GDS2 diagnostic system for comprehensive analysis.
- Ask about TSBs or software updates for the new 2.5L turbo platform.
- Do not attempt DIY repairs on a vehicle under warranty.
Repair Costs
Fully covered under the 3-year/36,000-mile bumper-to-bumper warranty and 8-year/80,000-mile federal emissions warranty. Out of pocket: $160–$380 for sensor replacement.
Summary
Take your redesigned 2024 Enclave to the dealer for a free warranty repair. First-year powertrain issues are normal, and this is a minor sensor repair that doesn't indicate broader reliability concerns.