AutoCodes – Toyota – P2252 2002 Toyota Highlander

P2252 2002 Toyota Highlander Code - A/F Sensor Bank 1 Short Circuit

Quick Answer

The Air-Fuel ratio (A/F) sensor provides output voltage approximately equal to the existing air-fuel ratio. Common causes include Faulty Air/Fuel Sensor Bank 2, Air/Fuel Sensor Bank 2 harness is open or shorted, Air/Fuel Sensor Bank 2 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: P2252 2002 Toyota Highlander indicates A/F Sensor Bank 1 Short Circuit.
Common causes: Common causes include Faulty Air/Fuel Sensor Bank 2, Air/Fuel Sensor Bank 2 harness is open or shorted, Air/Fuel Sensor Bank 2 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.

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Code Popularity 2,807

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2252 2002 Toyota Highlander Description

The Air-Fuel ratio (A/F) sensor provides output voltage approximately equal to the existing air-fuel ratio.
The A/F sensor output voltage is used to provide feedback for the Engine Control Module (ECM) to control the air-fuel ratio.
With the A/F sensor output, the ECM can determine deviation from the stoichiometric air-fuel ratio and control proper injection time. If the A/F sensor is malfunctioning, the ECM is unable to accurately control air-fuel ratio.
The A/F sensor is equipped with a heater which heats the zirconia element. The heater is also controlled by the ECM. When the intake air volume is low (the temperature of the exhaust gas is low), current flows to the heater which heats the sensor to facilitate detection of accurate oxygen concentration.
The A/F sensor is a planar type. Compared to a conventional type, the sensor and heater portions are narrower. Because the heat of the heater is conducted through the alumina to zirconia (of the sensor portion), sensor activation is accelerated.

The code is output when there is an open or short in the A/F sensor circuit, or if A/F sensor output drops. To detect these problems, the voltage of the A/F sensor is monitored when turning the ignition switch to the ON position, 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 A/F sensor is between 0.6 V and 4.5 V, it is considered normal. If the voltage is outside of the specified range, or the admittance is less than the standard value, the ECM will determine that there is a malfunction in the A/F sensor. If the same malfunction is detected in the next driving cycle, the MIL is illuminated and a DTC is set.

OBDII Code P2252 2002 Toyota Highlander - A/F Sensor Bank 1 Short Circuit - AutoCodes.com — P2252 2002 Toyota Highlander Code - A/F Sensor Bank 1 Short Circuit

What does this mean?

What are the Possible Causes of the DTC P2252 2002 Toyota Highlander?

Faulty Air/Fuel Sensor Bank 2
Air/Fuel Sensor Bank 2 harness is open or shorted
Air/Fuel Sensor Bank 2 circuit poor electrical connection
Air/Fuel Sensor Relay
Faulty Engine Control Module (ECM)

How to Fix the DTC P2252 2002 Toyota Highlander?

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 P2252 2002 Toyota Highlander 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 P2252 2002 Toyota Highlander code?

Need more information on how to fix the P2252 2002 Toyota Highlander code? Get Access to Factory Service Manuals

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2252 2002 Toyota Highlander Code

1. What does the OBDII code P2252 on a 2002 Toyota Highlander indicate?

The code P2252 indicates a "A/F Sensor Bank 1 Short Circuit" issue on the 2002 Toyota Highlander.

2. What are the common symptoms of a A/F Sensor Bank 1 Short Circuit problem in a Toyota Highlander?

Common symptoms include poor engine performance, decreased fuel efficiency, rough idling, and potential stalling.

3. What can cause the A/F Sensor Bank 1 Short Circuit code P2252 in a 2002 Toyota Highlander?

Possible causes include a faulty A/F sensor, damaged wiring or connectors, a blown fuse, or an issue with the engine control module (ECM).

4. How can I diagnose the A/F Sensor Bank 1 Short Circuit issue in my Toyota Highlander?

Diagnosis involves using an OBDII scanner to retrieve the specific trouble code, inspecting the A/F sensor and related wiring for damage, and checking the fuse related to the sensor.

5. Can I continue driving my 2002 Toyota Highlander with the P2252 code?

It is not recommended to continue driving with the P2252 code as it can lead to further damage and reduced vehicle performance.

6. How can I repair the A/F Sensor Bank 1 Short Circuit problem in my Toyota Highlander?

Repair options include replacing the faulty A/F sensor, repairing damaged wiring or connectors, checking and replacing any blown fuses, and resetting the ECM.

7. Is it possible to clear the P2252 code in a 2002 Toyota Highlander without fixing the issue?

While you can clear the code with an OBDII scanner, it is crucial to address the root cause of the problem to prevent further issues.

8. Can a DIY enthusiast fix the A/F Sensor Bank 1 Short Circuit issue in a Toyota Highlander?

Depending on your level of automotive repair experience, you may be able to address this problem yourself by following repair guides and using the necessary tools.

9. How much does it typically cost to repair the A/F Sensor Bank 1 Short Circuit problem in a Toyota Highlander?

The cost of repairing this issue can vary depending on the root cause, but it may range from $200 to $500 for parts and labor at a professional auto repair shop.

10. Will replacing the A/F Sensor Bank 1 in my Toyota Highlander resolve the P2252 code?

While replacing the A/F sensor is a common solution, it is essential to diagnose the issue accurately to ensure that the root cause is properly addressed.