P2253 Toyota Code - A/F Sensor Bank 1 Short Circuit
Quick Answer
The Air Fuel Ratio (A/F) sensor generates a voltage that corresponds to the actual air-fuel ratio. Common causes include Faulty Air Fuel Ratio (A/F) Sensor Bank 1 Sensor 1, Air Fuel Ratio Sensor Bank 1 Sensor 1 harness is open or shorted, Air Fuel Ratio Sensor Bank 1 Sensor 1 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P2253 Toyota indicates A/F Sensor Bank 1 Short Circuit.
- Common causes
- Common causes include Faulty Air Fuel Ratio (A/F) Sensor Bank 1 Sensor 1, Air Fuel Ratio Sensor Bank 1 Sensor 1 harness is open or shorted, Air Fuel Ratio Sensor Bank 1 Sensor 1 circuit poor electrical connection.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code Popularity
6,209
How popular is this code, among other codes? Low
Repair Importance Level
Moderate (Service soon) (2 / 3)
Repair Difficulty Level
Intermediate (2 / 3)
Table of contents
Created and updated by
William Orellana on Mar 29, 2024
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Code P2253 Toyota Description
The Air Fuel Ratio (A/F) sensor generates a voltage that corresponds to the actual air-fuel ratio. This sensor voltage is used to provide the Engine Control Module (ECM) with feedback so that it can control the air-fuel ratio. The ECM determines the deviation from the stoichiometric air-fuel ratio level and regulates the fuel injection duration. If the air-fuel ratio sensor malfunctions, the ECM is unable to control the air-fuel ratio accurately.
The air-fuel ratio sensor is a planar type and is integrated with the heater, which heats the solid electrolyte (zirconia element). This heater is controlled by the ECM. When the intake air volume is low (the exhaust gas temperature is low), a current flows into the heater to heat the sensor, in order to facilitate accurate oxygen concentration detection. In addition, the sensor and heater portions are narrow types. The heat generated by the heater is conducted to the solid electrolyte through the alumina, and therefore sensor activation is accelerated.
In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC), and nitrogen oxide (NOx) components in the exhaust gas, a three-way catalytic converter is used. For the most efficient use of the three-way catalytic converter, the air-fuel ratio must be precisely controlled so that it is always close to the stoichiometric level.
The Diagnostic Trouble Code (DTC) is set when there is an open or short in the air-fuel ratio sensor circuit, or if the air-fuel ratio sensor output drops. To detect these problems, the voltage of the air-fuel ratio sensor is monitored when turning the ignition switch to ON, and the admittance (admittance is an electrical term that indicates the ease of flow of current) is checked while driving. If the voltage of the air-fuel ratio sensor is between 0.6 V and 4.5 V, it is considered normal. If the voltage is out of the specified range, or the admittance is less than the standard value, the ECM determines that there is a malfunction in the air-fuel ratio sensor. If the same malfunction is detected in the next driving cycle, the MIL is illuminated, and a DTC is stored.
The air-fuel ratio sensor is a planar type and is integrated with the heater, which heats the solid electrolyte (zirconia element). This heater is controlled by the ECM. When the intake air volume is low (the exhaust gas temperature is low), a current flows into the heater to heat the sensor, in order to facilitate accurate oxygen concentration detection. In addition, the sensor and heater portions are narrow types. The heat generated by the heater is conducted to the solid electrolyte through the alumina, and therefore sensor activation is accelerated.
In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC), and nitrogen oxide (NOx) components in the exhaust gas, a three-way catalytic converter is used. For the most efficient use of the three-way catalytic converter, the air-fuel ratio must be precisely controlled so that it is always close to the stoichiometric level.
The Diagnostic Trouble Code (DTC) is set when there is an open or short in the air-fuel ratio sensor circuit, or if the air-fuel ratio sensor output drops. To detect these problems, the voltage of the air-fuel ratio sensor is monitored when turning the ignition switch to ON, and the admittance (admittance is an electrical term that indicates the ease of flow of current) is checked while driving. If the voltage of the air-fuel ratio sensor is between 0.6 V and 4.5 V, it is considered normal. If the voltage is out of the specified range, or the admittance is less than the standard value, the ECM determines that there is a malfunction in the air-fuel ratio sensor. If the same malfunction is detected in the next driving cycle, the MIL is illuminated, and a DTC is stored.
What are the Possible Causes of the DTC P2253 Toyota?
- Faulty Air Fuel Ratio (A/F) Sensor Bank 1 Sensor 1
- Air Fuel Ratio Sensor Bank 1 Sensor 1 harness is open or shorted
- Air Fuel Ratio Sensor Bank 1 Sensor 1 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P2253 Toyota?
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 P2253 Toyota 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.
Need more information about the P2253 Toyota code?
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Information for Specific Toyota Models
- P2253 2006 Toyota Camry — Oxygen A/F Sensor Reference Ground Circuit High Bank 1 Sensor 1
- P2253 2007 Toyota Camry — Oxygen A/F Sensor Reference Ground Circuit High Bank 1 Sensor 1
- P2253 2008 Toyota Camry — Oxygen A/F Sensor Reference Ground Circuit High Bank 1 Sensor 1
- P2253 2009 Toyota Camry — Oxygen A/F Sensor Reference Ground Circuit High Bank 1 Sensor 1
- P2253 2010 Toyota Camry — Oxygen A/F Sensor Reference Ground Circuit High Bank 1 Sensor 1
- P2253 2011 Toyota Camry — Oxygen A/F Sensor Reference Ground Circuit High Bank 1 Sensor 1
- P2253 2001 Toyota Highlander — A/F Sensor Bank 1 Short Circuit
- P2253 2002 Toyota Highlander — A/F Sensor Bank 1 Short Circuit
- P2253 2003 Toyota Highlander — A/F Sensor Bank 1 Short Circuit
- P2253 2004 Toyota Highlander — A/F Sensor Bank 1 Short Circuit
- P2253 2005 Toyota Highlander — A/F Sensor Bank 1 Short Circuit
- P2253 2006 Toyota Highlander — A/F Sensor Bank 1 Short Circuit
- P2253 2007 Toyota Highlander — A/F Sensor Bank 1 Short Circuit
- P2253 2004 Toyota Prius — Oxygen A/F Sensor Reference Ground Circuit High Bank 1 Sensor 1
- P2253 2005 Toyota Prius — Oxygen A/F Sensor Reference Ground Circuit High Bank 1 Sensor 1
- P2253 2006 Toyota Prius — Oxygen A/F Sensor Reference Ground Circuit High Bank 1 Sensor 1
- P2253 2007 Toyota Prius — Oxygen A/F Sensor Reference Ground Circuit High Bank 1 Sensor 1
- P2253 2008 Toyota Prius — Oxygen A/F Sensor Reference Ground Circuit High Bank 1 Sensor 1
- P2253 2009 Toyota Prius — Oxygen A/F Sensor Reference Ground Circuit High Bank 1 Sensor 1
- P2253 2013 Toyota RAV4 — A/F Sensor Bank 1 Short Circuit
- P2253 2014 Toyota RAV4 — A/F Sensor Bank 1 Short Circuit
- P2253 2015 Toyota RAV4 — A/F Sensor Bank 1 Short Circuit
- P2253 2016 Toyota RAV4 — A/F Sensor Bank 1 Short Circuit
- P2253 2017 Toyota RAV4 — A/F Sensor Bank 1 Short Circuit
- P2253 2018 Toyota RAV4 — A/F Sensor Bank 1 Short Circuit
About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles.
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