AutoCodes – Infiniti – P1164 Infiniti

P1164 Infiniti Code - HO2S21 Rich Shift Monitoring

Quick Answer

The Heated Oxygen Sensor 1 is placed into the exhaust manifold. Common causes include Faulty O2 Sensor Heater Bank 2 Sensor 1, O2 Sensor Heater Bank 2 Sensor 1 harness is open or shorted, O2 Sensor Heater Bank 2 Sensor 1 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1164 Infiniti indicates HO2S21 Rich Shift Monitoring.
Common causes: Common causes include Faulty O2 Sensor Heater Bank 2 Sensor 1, O2 Sensor Heater Bank 2 Sensor 1 harness is open or shorted, O2 Sensor Heater Bank 2 Sensor 1 circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 3,260

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 03, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1164 Infiniti Description

The Heated Oxygen Sensor 1 is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1 to 0V.

OBDII Code P1164 Infiniti - HO2S21 Rich Shift Monitoring - AutoCodes.com — P1164 Infiniti Code - HO2S21 Rich Shift Monitoring

What does this mean?

What are the Possible Causes of the DTC P1164 Infiniti?

Faulty O2 Sensor Heater Bank 2 Sensor 1
O2 Sensor Heater Bank 2 Sensor 1 harness is open or shorted
O2 Sensor Heater Bank 2 Sensor 1 circuit poor electrical connection

How to Fix the DTC P1164 Infiniti?

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 P1164 Infiniti 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.

Need more information about the P1164 Infiniti code?

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Information for Specific Infiniti Models

P1164 2003 Infiniti G35 — HO2S21 Rich Shift Monitoring

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.