Engine-Codes - Scion - P0133 SCION

P0133 SCION Code - Heated Oxygen Sensor Circuit Slow Response Bank 1 Sensor 1

- Code Popularity: 7,397 Views
- Repair Importance Level: 2/3
- Repair Difficulty Level: 2/3
Table of contents

|What are the Possible Causes of the P0133 SCION Code?

  • Open or short in HO2 sensor (bank 1 sensor 1) circuit
  • HO2 sensor (bank 1 sensor 1)
  • HO2 sensor heater (bank 1 sensor 1)
  • EFI relay
  • Air induction system
  • Fuel pressure
  • Injector
  • ECM

|How to Fix the P0133 SCION Code?

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.

|P0133 SCION code tech notes

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

|What is the cost to diagnose the P0133 SCION code?

Labor: 1.0

The cost to diagnose the P0133 SCION code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0133 SCION code detected?

The response of the voltage signal from the sensor takes more than the specified time.

|What are P0133 SCION code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • High Fuel Consumption
  • Excessive Smoke from Exhaust

|What Does the P0133 SCION Code Mean?

The Heated Oxygen (HO2) sensor (bank 1 sensor 1) monitors the oxygen concentration in the exhaust
gas. For optimum TWC operation, the air-fuel mixture must be maintained as close as possible to the
stoichiometric ratio. The HO2 sensor output voltage changes dramatically in the vicinity of the
stoichiometric ratio. By making adjustments in accordance with these signal voltages, the ECM adjusts
the fuel injection time so that the air-fuel ratio remains close to stoichiometric levels.
If the oxygen concentration in the exhaust gas increases, the air-fuel ratio is lean and the HO2 sensor
output voltage to the ECM drops below 0.45 V. If the oxygen concentration in the exhaust gas decreases,
the air-fuel ratio is rich and the HO2 sensor output voltage to the ECM increases to above 0.45 V.

Heated Oxygen Sensor Circuit Slow Response Bank 1 Sensor 1

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