Engine-Codes - Infiniti - P0133 INFINITI

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

- Code Popularity: 6,768 Views
- Repair Importance Level: 2/3
- Repair Difficulty Level: 2/3
Table of contents

|What are the Possible Causes of the P0133 INFINITI Code?

  • Faulty Air fuel ratio (A/F) sensor 1 bank 1
  • Air fuel ratio (A/F) sensor 1 bank 1 harness is open or shorted
  • Air fuel ratio (A/F) sensor 1 bank 1 circuit poor electrical connection
  • Inappropriate fuel pressure
  • Faulty fuel injectors
  • Intake air leaks may be faulty
  • Exhaust gas leaks

|How to Fix the P0133 INFINITI Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|P0133 INFINITI code tech notes

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

|What is the cost to diagnose the P0133 INFINITI code?

Labor: 1.0

The cost to diagnose the P0133 INFINITI code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0133 INFINITI 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

|What are P0133 INFINITI code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • High Fuel Consumption
  • Excessive Smoke from Exhaust

|What Does the P0133 INFINITI Code Mean?

The Air Fuel Ratio (A/F) sensor is a planar dual-cell limit current sensor. The sensor element of the A/F sensor is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement λ= 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide range (0.7 < λ < air).
The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance. An electronic circuit controls the pump current through the oxygen pump cell so that the composition of the exhaust gas in the diffusion gap remains constant at λ = 1. Therefore, the A/F sensor is able to indicate air/fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 - 800°C (1,292 - 1,472°F).

Air Fuel Ratio Circuit Slow Response Bank 1 Sensor 1

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