AutoCodes – Generic – P0136

P0136 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 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 113,816

How popular is this code, among other codes? Medium

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 Jul 24, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0136 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 - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2 - AutoCodes.com — P0136 Code - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0136?

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?

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 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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Information for Specific Makes

P0136 Acura — Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Audi — HO2S12 Sensor Range/Performance Condition
P0136 BMW — Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Buick — Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Cadillac — Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Chevrolet — Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Chrysler — Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Dodge — Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Ford — Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 GMC — Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Honda — Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Hummer — Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Hyundai — HO2S Circuit Bank 1 Sensor 2
P0136 Infiniti — O2 Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Isuzu — HO2S Circuit Sensor 2
P0136 Jeep — Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 KIA — HO2S12 Circuit Fault
P0136 Lexus — Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Lincoln — Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Mazda — HO2S12 Circuit Fault
P0136 Mercedes-Benz — O2 Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Mercury — Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 MINI — Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Mitsubishi — HO2S12 Circuit Fault
P0136 Nissan — O2 Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Pontiac — Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 RAM — Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Saturn — Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Scion — Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Subaru — O2 Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Toyota — Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Volkswagen — HO2S12 Sensor Range/Performance Condition

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 Code

1. What are common symptoms of OBDII code P0136?

- Common symptoms include poor fuel efficiency, rough idling, and the illumination of the Check Engine light.

2. What does OBDII code P0136 indicate?

- OBDII code P0136 indicates a malfunction in the heated oxygen sensor circuit for Bank 1 Sensor 2 in the vehicle's exhaust system.

3. What are possible causes of OBDII code P0136?

- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or issues with the vehicle's engine control module.

4. How can I diagnose the cause of OBDII code P0136?

- Diagnosis involves using an OBDII scanner to retrieve the code, inspecting the oxygen sensor and its wiring, checking for exhaust leaks, and testing the sensor's voltage.

5. Can I drive with OBDII code P0136?

- It is not recommended to drive for an extended period with this code as it can negatively impact the vehicle's performance and fuel efficiency.

6. How can I repair OBDII code P0136?

- Repair options may include replacing the oxygen sensor, repairing damaged wiring or connectors, fixing exhaust leaks, or reprogramming the engine control module.

7. How much does it cost to fix OBDII code P0136?

- The cost of repairs can vary depending on the underlying cause, but it may range from $100 to $500 or more, including parts and labor.

8. Can I reset OBDII code P0136 without fixing the issue?

- While you can clear the code temporarily, it is important to address the root cause to prevent further issues and potential damage to the vehicle.

9. How long does it take to fix OBDII code P0136?

- The repair time can vary based on the specific cause and complexity of the issue, but it may take anywhere from 30 minutes to a few hours.

10. Will OBDII code P0136 cause a vehicle to fail an emissions test?

- Yes, OBDII code P0136 typically indicates an emissions-related issue, which may cause the vehicle to fail an emissions test until the problem is resolved.