P2271 — O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2

What Does P2271 Mean?

P2271 is a diagnostic trouble code indicating: O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2. This code relates to the powertrain system. It has been reported in NHTSA complaints across 2 different vehicle models.

Symptoms of P2271

⚠️ Check engine light illuminated

Common Causes

🔍 Faulty oxygen sensor
🔍 Transmission component failure
🔍 Sensor or control module malfunction

Real Owner Reports

From NHTSA complaint database — actual owner descriptions.

"I purchased this vehicle on[XXX]. I was advised that there was an open recall for the O2 SENSOR. On 11/11/24, I took this vehicle to LOU BACHRODT in Coconut Creek,Fl. where they performed the recall. Shortly after having the recall done my vehicle's check engine light came on and then would turn off"
— Chevrolet Equinox owner, 11/11/2024

"First time I had problems with my 2021 Terrain I took it to victory GMC on 9/20/24. At the it had 45,000 miles. Every time I would drive and accelerate it would shake extremely bad in the floorboard. There was also transmission fluid leaking. I picked the car up on 9/27/2024 and was advised that bot"
— Gmc Terrain owner, 09/19/2024

Source: NHTSA Complaints Database

Most Reported Vehicles for P2271

Based on NHTSA owner complaint data.

#	Vehicle	Reports
1	CHEVROLET EQUINOX
2	GMC TERRAIN

Frequently Asked Questions

Can I drive with this code?

It depends on the severity. If the vehicle runs normally, short trips are usually OK. If you notice performance issues, drivability problems, or warning lights beyond the check engine light, get it checked soon.

Will this code clear itself?

Some codes clear automatically after the underlying issue is fixed and several drive cycles pass. But the root cause must be addressed first.

How do I find the exact cause?

A code alone doesn't pinpoint the failed part. You need a diagnostic scan ($50-150 at most shops) that reads freeze frame data and live sensor readings to identify the specific component.

What To Do Next

Possible Fixes

🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
🔧 Test the relevant sensor(s) with a multimeter before replacing
🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P2271: O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2