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P1133: HO2S Insufficient Switching Sensor 1

Severity
Medium
System
Manufacturer-Specific Powertrain
Last reviewed: Last updated:

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

What Does P1133 Mean?

P1133 is a diagnostic trouble code indicating: HO2S Insufficient Switching Sensor 1. This code relates to the manufacturer-specific powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P1133

Common Causes

Frequently Asked Questions

What does P1133 mean?
P1133 indicates: HO2S Insufficient Switching Sensor 1. The vehicle's computer has detected that the HO2S Insufficient Switching Sensor 1 is not operating within its expected parameters and stored this diagnostic trouble code.
Can I drive with code P1133?
You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1133 for extended periods may cause additional problems.
How much does it cost to fix P1133?
Repair costs for P1133 typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

  • 🔧 Inspect HO2S Insufficient Switching Sensor 1 and related wiring
  • 🔧 Replace faulty HO2S Insufficient Switching Sensor 1
  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

P1100 MAF Sensor Intermittent/ Check of all OBDII Systems Not Complete P1101 MAF Sensor Out Of Self Test Range./KOER Not Able To Complete KOER Aborted P1102 Mass Air Flow Sensor Signal Inconsistent With Throttle Position Sensor P1103 Mass Air Flow Sensor Signal Inconsistent With Engine Speed P1104 Oxygen Sensor Bank 1 Sensor 2 Voltage Too Low/Air Leak P1105 Open Or Shorted Condition Detected In The Baro Read Solenoid Control Circuit P1106 Dual Alternator Lower Fault/ Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage P1107 Dual Alternator Lower Circuit Malfunction/ Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage P1108 Oxygen Sensor Heating Circuit Bank 2 Sensor 1 Output Too Low P1109 Oxygen Sensor Circuit Bank 2 Sensor 2 Voltage Too Low/Air Leak