AutoCodes – Mazda – P0160 Mazda

P0160 Mazda Code - HO2S LR Circuit No Activity Detected

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: P0160 Mazda indicates HO2S LR Circuit No Activity Detected.
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 8,923

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0160 Mazda 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 P0160 Mazda - HO2S LR Circuit No Activity Detected - AutoCodes.com — P0160 Mazda Code - HO2S LR Circuit No Activity Detected

What does this mean?

What are the Possible Causes of the DTC P0160 Mazda?

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 P0160 Mazda?

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0160 Mazda 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 P0160 Mazda Code

1. What are the common symptoms of OBDII code P0160 in a Mazda related to the HO2S LR circuit?

- Common symptoms include poor fuel economy, engine misfires, rough idling, and an illuminated check engine light.

2. What does the OBDII code P0160 for the HO2S LR circuit in a Mazda mean?

- This code indicates that the oxygen sensor (HO2S) on the left (driver's side) downstream of the catalytic converter is not sending signals or has low activity.

3. What are some possible causes of the OBDII code P0160 related to the HO2S LR circuit in a Mazda?

- Common causes include a faulty oxygen sensor, damaged wiring or connectors in the circuit, exhaust leaks, or issues with the engine control module.

4. How can I diagnose the OBDII code P0160 in my Mazda with the HO2S LR circuit issue?

- Diagnosis typically involves inspecting the oxygen sensor and its connections, checking for exhaust leaks, and using a scan tool to monitor sensor data and confirm the code.

5. Can I continue driving my Mazda with the OBDII code P0160 related to the HO2S LR circuit active?

- It is not recommended to drive your vehicle with this code as it can lead to decreased fuel efficiency, performance issues, and potential damage to the catalytic converter.

6. Is it possible to repair the OBDII code P0160 in a Mazda with the HO2S LR circuit issue myself?

- While some DIYers may be able to replace the oxygen sensor or check for loose connections, it is recommended to have a professional mechanic diagnose and repair the issue for proper resolution.

7. How much does it typically cost to repair the OBDII code P0160 for the HO2S LR circuit in a Mazda?

- Repair costs can vary depending on the exact cause of the issue, but they may range from $100 to $300 for parts and labor.

8. Will resetting the OBDII code P0160 related to the HO2S LR circuit in my Mazda make it go away permanently?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue is not addressed, the code is likely to reappear once the vehicle is driven and the system detects the problem again.

9. How important is it to fix the OBDII code P0160 for the HO2S LR circuit in a Mazda promptly?

- It is important to address this code promptly to prevent potential damage to other engine components, ensure optimal fuel efficiency, and maintain overall vehicle performance.

10. Can a malfunctioning O2 sensor cause the OBDII code P0160 in a Mazda with the HO2S LR circuit issue?

- Yes, a malfunctioning oxygen sensor, particularly the one downstream of the catalytic converter on the left side, can trigger the P0160 code due to lack of activity or inaccurate readings.