P0131 on the 2024 Buick Envision
Your 2024 Buick Envision has triggered code P0131, meaning the Bank 1 Sensor 1 oxygen sensor is reading below the ECM's expected voltage. The 2024 Envision uses the 2.0L turbocharged four-cylinder (LSY) producing 228 hp. As an inline-four with a single bank, Bank 1 Sensor 1 is the upstream sensor between the turbo outlet and the catalytic converter.
Symptoms
- Check engine light on
- Slightly reduced fuel economy
- Minor idle roughness
- Subtle acceleration hesitation
- No safety concern
Likely Causes
1. O2 Sensor Defect
On a 2024 model, a factory-defective sensor is the most probable cause. The LSY turbo engine generates high exhaust temperatures that make any sensor weakness apparent quickly. Manufacturing variations in the sensing element can cause premature failure.
2. Assembly Wiring Issue
Connector not fully seated, harness pinched near the turbo, or routing too close to exhaust components are assembly-related issues on new vehicles.
3. Exhaust Leak
A factory gasket defect at the turbo-to-downpipe connection can introduce air past the O2 sensor, creating a false lean reading.
4. Software Update
GM may have ECM software updates available through GDS2 that refine O2 sensor monitoring thresholds for the Envision platform.
What to Do
- Schedule a Buick dealer appointment — full warranty applies.
- Dealer uses GDS2 for diagnosis and checks TSBs.
- Avoid unauthorized DIY repairs.
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: $150–$340.
Summary
Take your 2024 Envision to the dealer for a free warranty repair. This is a minor sensor issue typically resolved within a single appointment.