AutoCodes – Jeep – P0136 Jeep

P0136 Jeep Code - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2

Quick Answer

The Heated Oxygen Sensor 2 (HO2S2) (Downstream), after the three-way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Common causes include Exhaust gas leaks, Faulty Heated Oxygen Sensor 2 (HO2S2) (Downstream) Bank 1, Heated Oxygen Sensor 2 Bank 1 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: P0136 Jeep indicates Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2.
Common causes: Common causes include Exhaust gas leaks, Faulty Heated Oxygen Sensor 2 (HO2S2) (Downstream) Bank 1, Heated Oxygen Sensor 2 Bank 1 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.

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Code Popularity 3,116

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 Dec 24, 2021

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0136 Jeep Description

The Heated Oxygen Sensor 2 (HO2S2) (Downstream), after the 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 maintain near the ideal stoichiometric ratio. The HO2S2 output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Powertrain Control Module (PCM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S2 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 PCM interprets Lean when the HO2S2 voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The PCM interprets Rich when the HO2S2 voltage is above 0.45 V. The P0136 code will set when the PCM detects that the HO2S2 signal voltage is out of range for an extended period.

OBDII Code P0136 Jeep - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2 - AutoCodes.com — P0136 Jeep Code - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0136 Jeep?

Exhaust gas leaks
Faulty Heated Oxygen Sensor 2 (HO2S2) (Downstream) Bank 1
Heated Oxygen Sensor 2 Bank 1 harness is open or shorted
Heated Oxygen Sensor 2 Bank 1 circuit poor electrical connection
Inappropriate fuel pressure
Faulty fuel injectors

How to Fix the DTC P0136 Jeep?

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 P0136 Jeep 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 P0136 Jeep Code

1. What are common symptoms of OBDII code P0136 in a Jeep?

- Common symptoms include poor fuel economy, rough idle, hesitation during acceleration, and the illumination of the check engine light.

2. What does the OBDII code P0136 "Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2" mean for a Jeep?

- This code indicates a problem with the downstream oxygen sensor in the exhaust system on bank 1 of the engine.

3. What are possible causes of the P0136 code in a Jeep?

- Potential causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or issues with the engine's fuel system.

4. How can I diagnose the cause of the P0136 code in my Jeep?

- Use an OBDII scanner to read the code and inspect the oxygen sensor, wiring, and connectors for damage. Check for exhaust leaks and test the fuel system components.

5. Can I continue driving my Jeep with the P0136 code present?

- It is not recommended to drive with the P0136 code as it can lead to decreased fuel efficiency and potential damage to the catalytic converter.

6. How can I repair the P0136 code in my Jeep?

- Repair options include replacing the downstream oxygen sensor, repairing damaged wiring or connectors, fixing any exhaust leaks, and addressing fuel system issues.

7. Are there any DIY tips for fixing the P0136 code in a Jeep?

- DIY enthusiasts with proper tools and knowledge can attempt to replace the oxygen sensor themselves, following manufacturer guidelines.

8. How much does it typically cost to repair the P0136 code in a Jeep?

- The cost of repairs can vary depending on the root cause of the issue, but typically ranges from $100 to $300 for parts and labor.

9. How long does it take to fix the P0136 code in a Jeep?

- Repair times can vary, but replacing the oxygen sensor usually takes around 1-2 hours, while addressing wiring or exhaust leaks may take longer.

10. Can the P0136 code in a Jeep be triggered by a loose gas cap?

- While a loose gas cap can cause other codes related to the fuel system, it is unlikely to trigger the P0136 code specifically, which is related to the oxygen sensor circuit.