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P1164 Nissan Code - HO2S21 Rich Shift Monitoring

Quick Answer

The P1164 Nissan code refers to the "HO2S21 Rich Shift Monitoring" error. Common causes include Faulty oxygen sensor, Vacuum leak, Malfunctioning fuel injector. 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 Nissan indicates HO2S21 Rich Shift Monitoring.
Common causes
Common causes include Faulty oxygen sensor, Vacuum leak, Malfunctioning fuel injector.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P1164 Nissan Description

The P1164 Nissan code refers to the "HO2S21 Rich Shift Monitoring" error. This code indicates that there is an issue with the oxygen sensor located on the second bank of the engine (HO2S21) that is responsible for monitoring the air-fuel ratio. In this case, the sensor is detecting a rich fuel mixture, meaning that there is an excess of fuel compared to the amount of air present in the combustion process.

OBDII Code P1164 Nissan - HO2S21 Rich Shift Monitoring
P1164 Nissan Code - HO2S21 Rich Shift Monitoring

Common Causes of P1164 Nissan

  1. Faulty oxygen sensor
  2. Vacuum leak
  3. Malfunctioning fuel injector
  4. Clogged air filter
  5. Issue with the engine's coolant temperature sensor

Symptoms of P1164 Nissan

  1. Reduced fuel economy
  2. Engine misfires
  3. Rough idling
  4. Black smoke from the exhaust
  5. Reduced power output

How to Fix P1164 Nissan

  1. Perform a diagnostic scan to confirm the P1164 code and pinpoint the exact cause of the rich fuel condition.
  2. Inspect the oxygen sensor and replace it if necessary.
  3. Check for any vacuum leaks and repair them.
  4. Test the fuel injectors for proper operation and clean or replace them as needed.
  5. Inspect and replace the air filter if it is dirty or clogged.

Cost to Fix P1164 Nissan

The cost of repairing a P1164 Nissan code can vary depending on the specific cause of the issue and the labor rates in your area. On average, repairing this issue could range from $200 to $500, including parts and labor. Keep in mind that diagnostic time and labor rates can vary, so it's best to consult with a local auto repair shop for a more accurate estimate.

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Information for Specific Nissan 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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