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Engine-Codes – Honda – P0133 Honda

P0133 Honda Code - Air/Fuel Ratio Sensor 1 Malfunction/Slow Response

Quick Answer

When the diagnostic trouble code P0133 appears on a Honda vehicle, it indicates a malfunction or slow response from the Air/Fuel Ratio Sensor 1 (also known as the upstream oxygen sensor). Common causes include Faulty Air/Fuel Ratio Sensor, Wiring or connector issues, Exhaust leaks. 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 Honda indicates Air/Fuel Ratio Sensor 1 Malfunction/Slow Response.
Common causes
Common causes include Faulty Air/Fuel Ratio Sensor, Wiring or connector issues, Exhaust leaks.
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 06, 2024
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Code P0133 Honda Description

When the diagnostic trouble code P0133 appears on a Honda vehicle, it indicates a malfunction or slow response from the Air/Fuel Ratio Sensor 1 (also known as the upstream oxygen sensor). This sensor is responsible for monitoring the oxygen content in the exhaust gases and sending this information to the engine control module (ECM) to adjust the air/fuel mixture for optimal combustion. A malfunction or slow response from this sensor can lead to a variety of performance issues and potential long-term damage if not addressed promptly.

OBDII Code P0133 Honda - Air/Fuel Ratio Sensor 1 Malfunction/Slow Response
P0133 Honda Code - Air/Fuel Ratio Sensor 1 Malfunction/Slow Response

Common Causes of P0133 Honda

  1. Faulty Air/Fuel Ratio Sensor
  2. Wiring or connector issues
  3. Exhaust leaks
  4. Vacuum leaks
  5. Engine mechanical problems

Symptoms of P0133 Honda

  1. Reduced fuel efficiency
  2. Engine misfires or hesitation
  3. Rough idling or stalling
  4. Increased emissions
  5. Check Engine Light illuminated on the dashboard

How to Fix P0133 Honda

  1. Diagnose the issue using a professional OBD-II scanner to confirm the P0133 code and identify the root cause.
  2. Inspect the Air/Fuel Ratio Sensor and its wiring for any signs of damage or corrosion. Replace the sensor if necessary.
  3. Check for exhaust or vacuum leaks and repair them accordingly.
  4. Clear the code using the OBD-II scanner and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to pinpoint the exact cause, such as checking the engine's mechanical condition.

Cost to Fix P0133 Honda

The cost of repairing a P0133 code on a Honda vehicle can vary depending on the specific cause of the issue. In general, replacing the Air/Fuel Ratio Sensor can range from $100 to $300, while addressing wiring or other mechanical problems may incur additional costs. Labor rates for this type of repair typically range from $80 to $150 per hour, but rates can vary based on location and the type of repair shop. It's recommended to consult with a professional mechanic for a more accurate cost estimate.

What does this mean?

Tech Notes for P0133 Honda

Replacing the Front Heated Oxygen Sensor Bank 1 usually takes care of the problem.

There are Factory Service Bulletins for the following Honda models:

1998-2001 Honda Prelude
1998-2001 Honda Prelude Factory Service Bulletin Honda Prelude OBDII Code P0133

1998-2002 Honda Accord
1998-2002 Honda Accord Factory Service Bulletin Honda Accord OBDII Code P0133

Need more information about the P0133 Honda code?

Need more information on how to fix the P0133 Honda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0133 Honda code diagnosed by a professional: Find a repair shop in your area

Information for Specific Honda 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.

Frequently Asked Questions about P0133 Honda Code

What does the OBDII code P0133 mean for a Honda vehicle?

P0133 indicates that the Air/Fuel Ratio Sensor 1 (upstream oxygen sensor) is responding too slowly to changes in the air/fuel mixture, which can affect engine performance and emissions.

What are the common symptoms of code P0133 in a Honda?

Common symptoms include poor fuel economy, rough idle, reduced engine performance, and the illumination of the Check Engine Light.

What causes the P0133 code to appear in a Honda?

Possible causes include a faulty air/fuel ratio sensor, an exhaust leak near the sensor, wiring or connector issues, or an engine running excessively rich or lean.

Can a dirty air filter cause the P0133 code in a Honda?

While unlikely, a severely clogged air filter can restrict airflow, potentially affecting the air/fuel mixture and triggering this code.

How do you fix the P0133 code on a Honda?

Repairs may involve replacing the air/fuel ratio sensor, fixing exhaust leaks, inspecting and repairing damaged wiring or connectors, or addressing engine performance issues.

Is it safe to drive a Honda with the P0133 code?

Driving with this code is generally safe in the short term, but prolonged driving can lead to poor fuel economy, increased emissions, and potential damage to the catalytic converter.

How much does it typically cost to fix the P0133 code on a Honda?

Repair costs can vary, but replacing the air/fuel ratio sensor typically ranges from $150 to $400, depending on labor rates and parts pricing.

Can a bad catalytic converter cause the P0133 code on a Honda?

A failing catalytic converter is not a direct cause of P0133, but if it affects the air/fuel ratio sensor's readings, it could potentially contribute to the issue.

How do you diagnose the P0133 code on a Honda?

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the air/fuel ratio sensor and wiring, checking for exhaust leaks, and testing the sensor's response time with a multimeter or scan tool.

Can a software update fix the P0133 code on a Honda?

In rare cases, a software update from the manufacturer may address issues with how the ECU interprets sensor data, but this is less common than hardware repairs.

Discuss the causes and fixes for P0133 Honda OBDII Code

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