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Engine-Codes – Infiniti – P0133 Infiniti

P0133 Infiniti Code - Air Fuel Ratio Circuit Slow Response Bank 1 Sensor 1

Quick Answer

The P0133 code for Infiniti vehicles indicates a problem with the Air Fuel Ratio Circuit Slow Response for Bank 1 Sensor 1. Common causes include Faulty air-fuel ratio sensor, Wiring or connector issues in the sensor circuit, Exhaust leaks near the sensor. 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
P0133 Infiniti indicates Air Fuel Ratio Circuit Slow Response Bank 1 Sensor 1.
Common causes
Common causes include Faulty air-fuel ratio sensor, Wiring or connector issues in the sensor circuit, Exhaust leaks near the sensor.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0133 Infiniti Description

The P0133 code for Infiniti vehicles indicates a problem with the Air Fuel Ratio Circuit Slow Response for Bank 1 Sensor 1. This means that the oxygen sensor located in the exhaust system before the catalytic converter is not responding as quickly as it should to changes in the air-fuel mixture. The oxygen sensor plays a crucial role in monitoring the amount of oxygen in the exhaust gases and providing feedback to the engine control module (ECM) to adjust the air-fuel ratio for optimal combustion.

OBDII Code P0133 Infiniti - Air Fuel Ratio Circuit Slow Response Bank 1 Sensor 1
P0133 Infiniti Code - Air Fuel Ratio Circuit Slow Response Bank 1 Sensor 1

Common Causes of P0133 Infiniti

  1. Faulty air-fuel ratio sensor
  2. Wiring or connector issues in the sensor circuit
  3. Exhaust leaks near the sensor
  4. Vacuum leaks in the intake system
  5. Engine running rich or lean due to other issues

Symptoms of P0133 Infiniti

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Engine misfires
  4. Check Engine Light illuminated
  5. Poor acceleration or hesitation

How to Fix P0133 Infiniti

  1. Diagnose the issue by using a scan tool to monitor the oxygen sensor's response time.
  2. Inspect the wiring and connectors for any damage or corrosion, repairing or replacing as needed.
  3. Check for exhaust leaks near the sensor and repair them if found.
  4. Perform a smoke test to identify and fix any vacuum leaks in the intake system.
  5. Replace the air-fuel ratio sensor if it is determined to be faulty.

Cost to Fix P0133 Infiniti

The typical repair costs for addressing a P0133 code in an Infiniti vehicle can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically ranging between $80 and $150. Rates may be higher at dealerships or in metropolitan areas, while independent shops may offer lower prices. For a more accurate estimate, it's advisable to check with local auto repair shops.

What does this mean?

Tech Notes for P0133 Infiniti

Replacing the Air fuel ratio (A/F) sensor 1 bank 1 usually takes care of the problem.



For Infiniti models before 2005 see: P0133 Infiniti

When is the Code Detected?

The Air Fuel Ratio (A/F) signal computed by Engine Control Module (ECM) from the A/F sensor 1 signal takes more than the specified time

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Information for Specific Infiniti Models

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.

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