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

- Code Popularity: 8,166 Views
- Repair Importance Level: 2/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P0133 Scion?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • 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
⚠ Does your Scion have Safety Recalls? → Check here

How to Fix the DTC P0133 Scion?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

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

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0133 Scion code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

When is the Code Detected?

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

What are Code Possible Symptoms?

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

Code P0133 Scion Description

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.

OBDII Code P0133 Scion - Heated Oxygen Sensor Circuit Slow Response Bank 1 Sensor 1 - AutoCodes.com
P0133 Scion Code - Heated Oxygen Sensor Circuit Slow Response Bank 1 Sensor 1

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