P2273: O2 Sensor Signal Biased/Stuck Rich Bank 2 Sensor 2

Severity

Low

NHTSA Reports

Vehicles Affected

System

Powertrain

Last reviewed: Jan 1, 0001 Last updated: Jan 1, 0001

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

What Does P2273 Mean?

P2273 is a diagnostic trouble code indicating: O2 Sensor Signal Biased/Stuck Rich Bank 2 Sensor 2. This code relates to the powertrain system. It has been reported in NHTSA complaints across 1 different vehicle models.

Symptoms of P2273

⚠️ Check engine light illuminated

Real Owner Reports

From NHTSA complaint database — actual owner descriptions.

"AUGUST 21 ON THE WAY TO WORK (4 MILE DRIVE) THE TRUCK STARTED TO SHAKE AND LOST POWER,CHECK ENGINE LIGHT CAME ON, WE TOOK THE TRUCK TO THE DEALER,AND THEY CAN NOT FIGURE WHAT IS GOING ON,SO THEY SAID THE ENGINE NEEDS TO BE REPLACED. THE CODES ARE P0022-P0305-P0307-P1184-P2198-P2273 MY FAMILY JUST"
— Ford Expedition owner, 08/21/2008

Source: NHTSA Complaints Database

Most Reported Vehicles for P2273

Based on NHTSA owner complaint data.

#	Vehicle	Reports
1	FORD EXPEDITION

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
🔧 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.