AutoCodes – Mercury – P2275 Mercury

P2275 Mercury Code - Oxygen Sensor Signal Stuck Rich Bank 1 Sensor 3

Quick Answer

The downstream heated oxygen sensor (HO2S) is forced rich and lean and monitored by the Powertrain Control Module (PCM). Common causes include Faulty O2 Sensor Bank 1 Sensor 3, Exhaust leaks, O2 Sensor Bank 1 Sensor 3 harness is open or shorted. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P2275 Mercury indicates Oxygen Sensor Signal Stuck Rich Bank 1 Sensor 3.
Common causes: Common causes include Faulty O2 Sensor Bank 1 Sensor 3, Exhaust leaks, O2 Sensor Bank 1 Sensor 3 harness is open or shorted.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,488

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P2275 Mercury Description

The downstream heated oxygen sensor (HO2S) is forced rich and lean and monitored by the Powertrain Control Module (PCM). The test fails if the PCM does not detect the output of the HO2S in a calibrated amount of time.

OBDII Code P2275 Mercury - Oxygen Sensor Signal Stuck Rich Bank 1 Sensor 3 - AutoCodes.com — P2275 Mercury Code - Oxygen Sensor Signal Stuck Rich Bank 1 Sensor 3

What does this mean?

What are the Possible Causes of the DTC P2275 Mercury?

Faulty O2 Sensor Bank 1 Sensor 3
Exhaust leaks
O2 Sensor Bank 1 Sensor 3 harness is open or shorted
O2 Sensor Bank 1 Sensor 3 circuit poor electrical connection

How to Fix the DTC P2275 Mercury?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2275 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2275 Mercury code?

Need more information on how to fix the P2275 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2275 Mercury code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.