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P1133 Honda Code - HO2S Insufficient Switching Sensor 1

Quick Answer

The P1133 diagnostic trouble code (DTC) for Honda vehicles indicates an issue with the HO2S (Heated Oxygen Sensor) Insufficient Switching Sensor 1. Common causes include Faulty oxygen sensor, Wiring or connector issues, Exhaust system leaks. 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
P1133 Honda indicates HO2S Insufficient Switching Sensor 1.
Common causes
Common causes include Faulty oxygen sensor, Wiring or connector issues, Exhaust system leaks.
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 10, 2024
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Code P1133 Honda Description

The P1133 diagnostic trouble code (DTC) for Honda vehicles indicates an issue with the HO2S (Heated Oxygen Sensor) Insufficient Switching Sensor 1. This code specifically pertains to the oxygen sensor located before the catalytic converter in the exhaust system. The oxygen sensor is responsible for monitoring the amount of oxygen in the exhaust gases and providing feedback to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion.

OBDII Code P1133 Honda - HO2S Insufficient Switching Sensor 1
P1133 Honda Code - HO2S Insufficient Switching Sensor 1

Common Causes of P1133 Honda

  1. Faulty oxygen sensor
  2. Wiring or connector issues
  3. Exhaust system leaks
  4. Vacuum leaks
  5. Engine mechanical problems

Symptoms of P1133 Honda

  1. Decreased fuel efficiency
  2. Engine misfires
  3. Rough idling or stalling
  4. Illuminated check engine light
  5. Increased emissions

How to Fix P1133 Honda

  1. Diagnose the issue by using a scan tool to monitor the oxygen sensor readings and check for any related codes.
  2. Inspect the oxygen sensor, wiring, and connectors for any signs of damage or corrosion.
  3. Test the oxygen sensor's heater circuit to ensure proper operation.
  4. Replace the oxygen sensor if it is found to be faulty or not responding correctly.
  5. Clear the DTC and perform a road test to verify that the issue has been resolved.

Cost to Fix P1133 Honda

The cost of repairing a P1133 code on a Honda vehicle can vary depending on the specific model and year of the vehicle, as well as the labor rates in your area. In general, replacing the oxygen sensor can cost anywhere from $100 to $300, including parts and labor. Additional costs may apply if there are other underlying issues that need to be addressed. It is recommended to consult a professional mechanic for an accurate estimate based on your vehicle's needs.

When is the Code Detected?

If the Powertrain Control Module (PCM) determines that the front HO2S did not switch enough times, the PCM will set the P1133 code.

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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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