AutoCodes – Chrysler – P2271 Chrysler

P2271 Chrysler Code - O2 Sensor 1/2 Signal Biased Rich

Quick Answer

The Powertrain Control Module (PCM) supplies a voltage of about 450 mV between the HO2S high and low signal circuits. Common causes include Faulty Rear Heated Oxygen Sensor Bank 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection. 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: P2271 Chrysler indicates O2 Sensor 1/2 Signal Biased Rich .
Common causes: Common causes include Faulty Rear Heated Oxygen Sensor Bank 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection.
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.

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Code Popularity 4,634

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
FAQs
Comments
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Code P2271 Chrysler Description

The Powertrain Control Module (PCM) supplies a voltage of about 450 mV between the HO2S high and low signal circuits. The oxygen sensor varies the voltage over a range from about 1,000 mV when the exhaust is rich, down through about 10 mV when the exhaust is lean.
The PCM monitors and stores the heated oxygen sensor (HO2S) voltage information. The PCM evaluates the HO2S voltage samples in order to determine the amount of time the HO2S voltage was out of range. The PCM compares the stored HO2S voltage samples taken within each sample period and determines if majority of the samples are out of the operating range.

OBDII Code P2271 Chrysler - O2 Sensor 1/2 Signal Biased Rich - AutoCodes.com — P2271 Chrysler Code - O2 Sensor 1/2 Signal Biased Rich

What does this mean?

What are the Possible Causes of the DTC P2271 Chrysler?

Faulty Rear Heated Oxygen Sensor Bank 1
Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
Intake air leaks
Exhaust gas leaks
Inappropriate fuel pressure
Faulty fuel injectors

How to Fix the DTC P2271 Chrysler?

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 P2271 Chrysler 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.

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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.

Frequently Asked Questions about P2271 Chrysler Code

1. What does OBDII code P2271 on a Chrysler indicate?

- It indicates that the O2 Sensor 1/2 Signal is biased rich, meaning the oxygen sensor is detecting a consistently rich air-fuel mixture.

2. What are some common symptoms of OBDII code P2271 in a Chrysler vehicle?

- Common symptoms include decreased fuel efficiency, rough idling, engine misfires, and the illumination of the check engine light.

3. What are the possible causes of OBDII code P2271 in a Chrysler?

- Possible causes include a faulty oxygen sensor, a vacuum leak, a rich fuel mixture, issues with the fuel injection system, or problems with the engine's computer.

4. How can I diagnose the O2 Sensor 1/2 Signal Biased Rich issue in a Chrysler?

- Diagnosing this issue typically involves using an OBDII scanner to read the code, inspecting the oxygen sensor for damage or contamination, and checking for any vacuum leaks in the intake system.

5. Can driving with OBDII code P2271 on a Chrysler cause further damage to the vehicle?

- Driving with this code may lead to decreased fuel efficiency and potential damage to the catalytic converter over time if left unresolved.

6. How can I repair OBDII code P2271 in a Chrysler?

- Repair options include replacing the oxygen sensor, addressing any vacuum leaks, tuning the engine for the correct air-fuel mixture, or resetting the engine control module.

7. Is it safe to continue driving a Chrysler with OBDII code P2271?

- It is generally not recommended to continue driving with this code illuminated, as it can lead to potential performance issues and decreased fuel efficiency.

8. How much does it typically cost to repair O2 Sensor 1/2 Signal Biased Rich in a Chrysler?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $500, including parts and labor.

9. Can I reset the check engine light after fixing OBDII code P2271 in my Chrysler?

- Yes, you can reset the check engine light using an OBDII scanner once the underlying issue has been addressed and repaired.

10. How often should I check the oxygen sensors in my Chrysler to prevent O2 Sensor 1/2 Signal Biased Rich issues?

- It is recommended to have the oxygen sensors inspected during routine maintenance or whenever you notice symptoms of poor engine performance to prevent such issues from occurring.