AutoCodes – Honda – P1133 Honda

P1133 Honda Code - HO2S Insufficient Switching Sensor 1

Quick Answer

The Engine Control Module (ECM) monitors the Heated Oxygen Sensor (HO2S) activity for 90 seconds after closed loop operation has begun. Common causes include Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1, Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 harness is open or shorted, Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 circuit poor electrical conection. 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 Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1, Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 harness is open or shorted, Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 circuit poor electrical conection.
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 5,818

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 Apr 28, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1133 Honda Description

The Engine Control Module (ECM) monitors the Heated Oxygen Sensor (HO2S) activity for 90 seconds after closed loop operation has begun. The ECM determines if the front HO2S is functioning properly by counting the number of HO2S-1 Lean/Rich (L/R) and Rich/Lean (R/L) switches.

OBDII Code P1133 Honda - HO2S Insufficient Switching Sensor 1 - AutoCodes.com — P1133 Honda Code - HO2S Insufficient Switching Sensor 1

What does this mean?

What are the Possible Causes of the DTC P1133 Honda?

Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 harness is open or shorted
Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 circuit poor electrical conection
Air leak in exhaust near O2 sensor

How to Fix the DTC P1133 Honda?

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 P1133 Honda 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.

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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.