P1148 Nissan Code: Closed-loop Control Issues & Solutions

If you own a Nissan and are dealing with the P1148 code, you’ve come to the right place.

This article is your go-to resource for all things P1148 Nissan code. I’m here to guide you through it all, sharing my expertise and experience to help you understand what this code means and how to fix it like a pro. 

So, let’s dive in!

P1148 Nissan: A Quick Overview

Let’s take a quick look at the key details of the P1168 Nissan code in the summary box below!

  • Definition: Closed Loop Control Function Bank 1
  • Severity: Medium
  • DIY Skill Level: Intermediate
  • Continue To Drive?: Yes 
  • Estimated Repair Cost: $50 – $200

Inside The P1148 Nissan Code: What Does It Mean? 

The P1148 code in Nissan vehicles indicates a problem with the closed-loop control function of the A/F sensor or the conventional Heated Oxygen Sensor (HO2S) circuit for Bank 1. This code is triggered by the engine control module (ECM) when it detects that the closed-loop control function is not operating properly under certain driving conditions.

Note: Throughout this guide, when we refer to “sensor,” we mean both the A/F sensor and HO2S sensor, as they share similarities and can cause the P1148 code.

P1148 on Nissan vehicle
P1148 Code detected – it’s time to have a look at your A/F sensor.
(Image credit: Pathfinder Talk forum)

To comprehend the P1148 code, it’s important to clearly understand the systems and components involved. The A/F sensor plays a vital role in measuring the oxygen content within the exhaust gases. This crucial data is then utilized by the ECM to finely adjust the air-fuel mixture, optimizing combustion efficiency for better performance.

This code is commonly found in models such as Altima, Pathfinder, Frontier, Titan, Murano, Sentra, Xterra, Maxima, Rogue, 350z, Armada, Quest, Versa, and Juke. It’s worth noting that this code often accompanies codes P0041 and P0031, both of which relate to O2 sensor concerns.

Read more: P1168 Nissan Code – a similar code to the P1148 code, but P1168 is specific to Bank 2 in Nissan vehicles.

How Serious Is The P1148 Nissan Code?

The severity level of the P1148 Nissan code can be considered moderate. While it does not pose immediate dangers or render the vehicle undrivable, addressing the problem as soon as possible is advisable.

Although you may be able to continue driving with the P1148 code for a limited period, it’s important to address the underlying issue. Prolonged driving without resolving the problem can decrease fuel efficiency and potentially impact engine performance. 

To avoid further complications and potential damage, diagnose and repair the problem promptly. Taking proactive measures will help prevent more severe issues from arising down the road.

Warning Signs Of P1148 Nissan 

The following are common symptoms associated with the P1148 code:

  • Check Engine Light (CEL) and/or Service Engine Soon (SES) light illuminated
  • Decreased engine performance
  • Reduced fuel efficiency
  • Rough idle
  • Irregular exhaust emissions

Causes Of The P1148 Nissan Code

The P1148 code can be caused by various factors, including:

  • Open or shorted circuit in the A/F sensor or HO2S circuit for Bank 1
  • Malfunctioning A/F sensor or HO2S sensor for Bank 1
  • Faulty A/F sensor or HO2S sensor heater for Bank 1

Read more: Nissan Trouble Codes: Comprehensive List For OBD1/OBD2 Codes

P1148 Nissan Code: DIY Diagnosis And Repair

If you’ve encountered the P1148 code in your Nissan vehicle, you can attempt a DIY diagnosis and repair before seeking professional assistance. Follow the step-by-step guide below:

Essential Tools And Parts

To diagnose and repair the P1148 code, you may require the following tools and parts:

Your Step-by-Step Guide To Tackle P1148

  1. Inspect the wiring and connectors associated with the sensor for Bank 1. Look for any signs of damage, loose connections, or corrosion. Ensure that the wiring is securely connected and free from any obstructions.
  2. Test the voltage and resistance of the sensor using a multimeter. This will help determine if the sensor is functioning within the specified range. Consult the vehicle’s service manual for the appropriate voltage and resistance values.
  3. If needed, remove the sensor using an appropriate oxygen sensor socket and replace it with a new one. 
  4. Clear the code and perform a system test to ensure that you have resolved the issue.

Quick Tips: 

  • Apply anti-seize compound to the sensor threads before installation to facilitate future removal. 
  • Common location of A/F sensor for Bank 1 in Nissan vehicles: Typically, it’s bolted onto the exhaust manifold or front section of the exhaust pipe. Check the service manual or consult a Nissan dealership for exact location details.

Notes: It’s important to consult the vehicle’s repair manual for specific instructions and diagrams related to your particular Nissan model.

Check this video to learn how to replace the A/F sensor and fix the P1148 like a pro.

DIY Repair Level And Estimated Costs

Diagnosing the P1148 code and inspecting the wiring and connectors can be performed by DIY enthusiasts with intermediate-level skills. However, replacing the sensor may require more advanced knowledge and tools. If you’re unsure or uncomfortable with the repair process, we recommend consulting a qualified mechanic.

The table below provides estimated costs for common repair tasks associated with the P1148 code in Nissan vehicles.  

Repair TaskEstimated Cost Range
Diagnosing the code$50 – $150
Wiring harness connectors and terminals$50 – $100
Inspecting wiring/connectors$50 – $100 
Replacing sensors$100 – $200

Please note that these estimated costs are only for reference purposes and can vary based on location, the specific vehicle model, and labor rates. We recommend consulting a qualified mechanic or obtaining a detailed quote to assess the cost accurately.

P1148 Nissan Infographic

P1148 Nissan
Check this infographic for the summarized information about this P1148 code on Nissan vehicles.

Final Thoughts

To wrap things up, taking on the P1148 code in your Nissan is entirely achievable. 

Just make sure you have the right tools and follow the steps provided. By doing so, you’ll be able to address any issues with the A/F sensor and HO2S circuit for Bank 1, ultimately giving your engine a performance boost. You’ve got this!

Remember to stay cautious, consult the repair manual if needed, and consider professional help if unsure.

Share this knowledge with others and enjoy the journey of fixing your vehicle. Safe driving!

Reference Sources

  1. Tire Review Magazine, 2011 May 6, Fuel System Definitions and Diagnostic Trouble Codes.
  2. Automotive Manuals, 2007, Nissan Engine Control System Diagnosis Guide – page EC-393. 

About The Author

Leave a Comment

Your email address will not be published. Required fields are marked *