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P0155 Chrysler Code - O2 Sensor 2/1 Heater Performance

Quick Answer

The P0155 Chrysler code indicates a problem with the O2 sensor 2/1 heater performance. Common causes include Faulty O2 sensor heater, Wiring or connector issues, Blown fuse related to the O2 sensor heater circuit. 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
P0155 Chrysler indicates O2 Sensor 2/1 Heater Performance.
Common causes
Common causes include Faulty O2 sensor heater, Wiring or connector issues, Blown fuse related to the O2 sensor heater circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 30, 2024
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Code P0155 Chrysler Description

The P0155 Chrysler code indicates a problem with the O2 sensor 2/1 heater performance. The O2 sensor, or oxygen sensor, is responsible for measuring the amount of oxygen in the exhaust gases and providing feedback to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. The heater in the sensor is designed to quickly bring it up to operating temperature for accurate readings.

OBDII Code P0155 Chrysler - O2 Sensor 2/1 Heater Performance
P0155 Chrysler Code - O2 Sensor 2/1 Heater Performance

Common Causes of P0155 Chrysler

  1. Faulty O2 sensor heater
  2. Wiring or connector issues
  3. Blown fuse related to the O2 sensor heater circuit
  4. ECM software update needed
  5. Exhaust leak near the O2 sensor

Symptoms of P0155 Chrysler

  1. Decreased fuel efficiency
  2. Rough idle or stalling
  3. Check Engine Light illuminated
  4. Failed emissions test
  5. Engine running rich or lean

How to Fix P0155 Chrysler

  1. Diagnose the specific cause of the code by checking the O2 sensor heater circuit and related components.
  2. Test the O2 sensor heater for proper function.
  3. Replace the O2 sensor if the heater is found to be faulty.
  4. Repair any wiring or connector issues.
  5. Clear the code from the ECM and perform a test drive to ensure the issue is resolved.

Cost to Fix P0155 Chrysler

The cost of repairing a P0155 Chrysler code can vary depending on the specific cause of the issue. On average, replacing an O2 sensor can cost between $200 and $400, including parts and labor. However, additional costs may apply if there are wiring or connector issues that need to be addressed. It's recommended to consult with a qualified mechanic for a more accurate estimate based on the vehicle's make and model.

What does this mean?

Tech Notes for P0155 Chrysler

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The Engine Control Module (ECM) monitors how long it take the sensor to warm up and start sending an adequate signal. The code means the the sensor is taking too long to warm up. Replacing the Front Heated Oxygen Sensor (H2OS) Bank 2 usually takes care of the problem.

When is the Code Detected?

The current amperage in the front heated oxygen sensor heater circuit is out of the normal range. (An improper voltage drop signal is sent to ECM through the front heated oxygen sensor heater)

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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.

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