Engine-Codes - Isuzu - P1133 ISUZU

P1133 ISUZU - H02S Insufficient Switching Bank 1 Sensor 1

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P1133 ISUZU Possible Causes

  • 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 is the P1133 ISUZU code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the P1133 ISUZU code

Labor: 1.0

The cost to diagnose the P1133 ISUZU code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

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.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1133 ISUZU Meaning

The Powertrain Control Module (PCM) monitors the Heated Oxygen Sensor (HO2S) activity for 90 seconds after closed loop operation has begun. The PCM 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.

More Information

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