P1155 Toyota Code - Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1
Quick Answer
Air-Fuel Ratio (A/F)sensor need to reach a minimum operating temperature of 1200 degrees F to produce an accurate voltage signal. Common causes include Faulty Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1, Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 harness is open or shorted, Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1155 Toyota indicates Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1.
- Common causes
- Common causes include Faulty Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1, Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 harness is open or shorted, Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1155 Toyota Description
In order to achieve the require temperature, a heater element is included inside the air-fuel ratio sensor. The ECM controls the air-fuel ratio sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.
The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.
What are the Possible Causes of the DTC P1155 Toyota?
- Faulty Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1
- Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 harness is open or shorted
- Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P1155 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 P1155 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 P1155 Toyota code?
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Need Help with the Code?
Get the P1155 Toyota code diagnosed by a professional: Find a repair shop in your area
Information for Specific Toyota Models
- P1155 2002 Toyota Camry — Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1
- P1155 Toyota RAV4 — Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1
Frequently Asked Questions about P1155 Toyota Code
1. What are the common symptoms of OBDII code P1155 Toyota?
Common symptoms include poor fuel efficiency, rough idling, engine hesitation, and the illumination of the Check Engine Light.
2. What does the OBDII code P1155 Toyota indicate?
This code indicates a malfunction in the air/fuel ratio sensor heater circuit for Bank 2 Sensor 1 in the vehicle's exhaust system.
3. What are the possible causes of the P1155 code in a Toyota vehicle?
Possible causes include a faulty air/fuel ratio sensor, damaged wiring or connectors in the sensor circuit, a blown fuse, or a problem with the engine control module (ECM).
4. How can I diagnose the P1155 code in my Toyota?
Diagnosis typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the sensor and its wiring for damage, and checking the related fuses for continuity.
5. Can I continue driving my vehicle with the P1155 code present?
It is generally not recommended to drive with this code present, as it can lead to decreased fuel efficiency and potential engine performance issues.
6. How can I repair the Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1 code in my Toyota?
Repair options may include replacing the air/fuel ratio sensor, repairing damaged wiring or connectors, replacing blown fuses, or reprogramming the ECM if necessary.
7. Will resetting the Check Engine Light clear the P1155 code?
Resetting the Check Engine Light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return after driving the vehicle for a while.
8. How much does it cost to repair the P1155 code in a Toyota?
The cost of repair can vary depending on the specific cause of the code, but it may range from $150 to $500 or more, including parts and labor.
9. Can I replace the air/fuel ratio sensor myself to fix the P1155 code?
Replacing the air/fuel ratio sensor can be a DIY task for those with mechanical experience and the necessary tools. However, if you're unsure, it's best to have a professional technician handle the repair.
10. How often does the P1155 code occur in Toyota vehicles?
The P1155 code related to the air/fuel ratio sensor heater circuit malfunction is a relatively common issue in Toyota vehicles, particularly in older models or those with high mileage.
Discuss the causes and fixes for P1155 Toyota OBDII Code
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Que modelo y año es tu Toyota? puede ser que la computadora necesite programarla o que tenga un fuga de aire.
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Gio si remplasaste el sensor y la luz regresa instantaniamente puede ser muy posible que tengas un corto en el cableado
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Es el mismo codigo? Algunas veces el problema que hay alguna fuga de escape cerca del sensor.
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I'm getting code P1155 on my 2002 Toyota Camry 3.0 v6 A/F Sensor Heater Circuit Malfunction,I was told it was Bank 2 sensor 1 ,just wondering where is that sensor located ,any help please
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Hi! I have the same problem Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1
Toyota Highlander 2002 v6 3.0 where is this sensor ? Thank you -
Unfortunately there are no detailed images on the factory service manual. Here is the only image I got, I hope it helps.
Click here to enlarge image
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