AutoCodes – Chrysler – P0157 Chrysler

P0157 Chrysler Code - O2 Sensor 2/2 Circuit Low

Quick Answer

The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Common causes include Faulty Rear Heated Oxygen Sensor Bank 2, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted, Rear Heated Oxygen Sensor Bank 2 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: P0157 Chrysler indicates O2 Sensor 2/2 Circuit Low.
Common causes: Common causes include Faulty Rear Heated Oxygen Sensor Bank 2, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted, Rear Heated Oxygen Sensor Bank 2 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 22,452

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 May 27, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0157 Chrysler Description

The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Engine Control Module (ECM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The ECM interprets Lean when the HO2S voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The ECM interprets Rich when the HO2S voltage is above 0.45 V.

OBDII Code P0157 Chrysler - O2 Sensor 2/2 Circuit Low - AutoCodes.com — P0157 Chrysler Code - O2 Sensor 2/2 Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0157 Chrysler?

Faulty Rear Heated Oxygen Sensor Bank 2
Rear Heated Oxygen Sensor Bank 2 harness is open or shorted
Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection
Inappropriate fuel pressure
Faulty fuel injectors
Intake air leaks may be faulty
Exhaust gas leaks

How to Fix the DTC P0157 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 does this mean?

Code Tech Notes

Replacing the Rear Heated Oxygen Sensor Bank 2 usually takes care of the problem.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0157 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 P0157 Chrysler Code

1. What does the OBDII code P0157 mean on a Chrysler?

P0157 indicates that the oxygen sensor located in Bank 2, Sensor 2, is detecting a low voltage signal, which typically means the air-fuel mixture is too lean.

2. What are the symptoms of code P0157 on a Chrysler vehicle?

Common symptoms include reduced fuel efficiency, rough idling, hesitation during acceleration, and possibly the illumination of the Check Engine Light.

3. What causes the P0157 code to appear in a Chrysler?

The code can be caused by a faulty downstream oxygen sensor, exhaust leaks, damaged wiring or connectors, or a malfunctioning engine control module (ECM).

4. Can a bad catalytic converter cause the P0157 code in a Chrysler?

Yes, a failing catalytic converter can affect the downstream oxygen sensor readings and trigger the P0157 code.

5. How do you diagnose the P0157 code on a Chrysler?

Diagnosis involves using a scan tool to monitor O2 sensor voltage, inspecting the sensor and its wiring for damage, and checking for exhaust leaks near the sensor.

6. Can you drive a Chrysler with the P0157 code active?

While the vehicle may still be drivable, prolonged operation with this code can lead to decreased performance and potential damage to the catalytic converter.

7. How do you fix the P0157 code on a Chrysler?

Repairs may include replacing the faulty oxygen sensor, repairing damaged wiring, fixing exhaust leaks, or addressing any related engine performance issues.

8. How much does it cost to fix a P0157 code on a Chrysler?

Repair costs vary but typically range from $150 to $400, depending on whether the oxygen sensor or other components need replacement.

9. Will clearing the P0157 code solve the problem on a Chrysler?

Clearing the code will turn off the Check Engine Light temporarily, but the underlying issue will need to be resolved to prevent the code from returning.

10. Can a vacuum leak trigger the P0157 code on a Chrysler?

While uncommon, a vacuum leak can impact engine performance and air-fuel ratios, indirectly contributing to conditions that might trigger the P0157 code.