Diagnose and Fix P1155 Error Code in Your Toyota Rav4 – Causes & Solutions

Most drivers are unsure of what’s happening whenever the engine light on their Toyota Rav4 blinks. One common reason for this warning is the P1155 error code, and drivers may have trouble understanding it.

Bank 2, Sensor 1, typically displays the error code P1155 when there is a problem with the air/fuel ratio sensor of the heater circuit. This error indicates that the heating element of the air/fuel ratio sensor is not working and needs fixing.

Almost all cars’ heating elements are primarily in the car’s exhaust system. The car’s heater is unable to reach its basic temperature and provides wrong and improper results, which can directly impact the car’s performance.

Every driver, especially Toyota drivers, should know about the P1155 error because only then can they know how to fix it. By properly addressing the underlying issue, drivers can prevent additional damage and ensure the continued dependability of their vehicles.

P1155 Error Code Toyota Rav4:

Before understanding the basics of the P1155 error code, it’s essential to know and understand the part of OBD-II codes in vehicle diagnostics. OBD-II, or Onboard Diagnostics II, is a standardized system of modern cars in present-day vehicles to keep track, monitor, and report the performance of different components and parts of your car.

Whenever a fault is recognized, the vehicle’s onboard computer produces a diagnostic trouble code (DTC) as a numerical identifier for that particular issue. These codes can be seen on an OBD-II scanner, allowing the car specialist technicians to pinpoint the source of the issue rapidly.

Among the myriad of OBD-II codes, the P1155 error code holds particular significance for the owners of Toyota RAV4. P1155 is a basic error of DTC, which means there is an issue with the Air/fuel ratio sensor of the heater circuit for Bank 2, Sensor 1. Let me explain it in simpler words: there is a fault in the air-to-fuel ratio sensor in your car, which is most likely in your car exhaust system.

It’s a never ending battle of making your cars better and also trying to be better yourself.Dale Earnhardt

Causes of P1155 Error Code:

There are a couple of different reasons for a Toyota Rav4 to face or get the P1155 error, some of which are given below.

Defective Air/Fuel Ratio Sensor:

One of the foremost reasons for getting that error code is a damaged or defective air/fuel sensor heater. The sensor’s heating part may fall apart or break down over time, keeping it from reaching the perfect working temperature.

Wiring Problems:

A breakdown in the air/fuel ratio sensor can be caused by damage or loose wiring within the sensor circuit, which stops the power from coming to the heating component or area of the sensor.

Vacuum Leaks:

Another reason for the error code is the lean or damaged vacuum system of your car, which also gives you inaccurate or false readings, which could also be the reason for setting the P1155 error code.

Indications of P1155 Error Code:

When the P1155 error code is activated in a Toyota RAV4, a few indications may show that you should know about. Some of them are given below.

Check your Engine Light:

The foremost self-evident sign of a P1155 error problem is the blinking light on your engine that is mentioned or shown in the vehicle’s dashboard. This is a caution to the driver that a fault has been identified within the engine area.

Bad Fuel Economy:

A damaged air/fuel ratio sensor can lead to wrong or improper fuel readings, which are the reason for decreased fuel efficiency and potentially lead to higher fuel usage.

Stalling:

Unpredictable engine idling or slowing down may result from improper air/fuel mixture, causing the Toyota rav4 engine to run very rough on most terrains.

If you are interested in getting more details, please watch the video below to solve the problem more quickly; otherwise, continue the reading.

Diagnosing and Repairing P1155:

Diagnosing the P1155 error code requires a proper approach and the utilization of most of the diagnostic tools:

Diagnostic Process:

Start the diagnostic process by connecting an OBD-II scanner to the vehicle’s onboard diagnostic port for reading and recovering the current fault codes, which in this case is P1155. You can also note any extra codes shown that may give further details about the issue.

Components Inspection:

Review the air/fuel ratio sensor and all its related wiring to tackle any signs of wear and tear, breakdown, or damage. You should also check for loose wires, which can also be the reason. After that, make sure to fix the sensor in its place securely.

Solution for Repairing:

Depending on the discoveries of the previous diagnostic procedure, a few repair arrangements may be essential. The repair needed for your Toyota totally depends on your car’s situation. You might need one repair or a few.

Replace the Air/Fuel Sensor:

If the sensor is found to be defective, then it must be replaced with a new sensor. But before getting a new one, check its specifications and get one that fits your Toyota rav4’s needs and requirements.

Fixing Wiring Issues:

First of all, fix any damaged or cut wires if possible, but if not, then you should also replace them with new and stronger wires. Make sure that the wires are also according to the circuit board and that they are correctly fixed.

Vacuum Leaks:

If vacuum spills are recognized or found within the sensor circuit system, then repair them or replace them with a new one. After replacing it, check the vacuum airflow and pressure.

How to Prevent it from Happening:

To prevent P1155 code errors or other codes like these, you have to follow some prevention tips and techniques. We define some in the article below, so let’s find out.

Standard Vehicle Inspections:

Plan customary assessments with an appropriately qualified specialist to recognize and address potential issues as soon as they get to your car and prevent them from turning into big problems.

Scheduled Maintenance:

You have to follow your car’s manufacturer’s suggested maintenance schedule plan, which in this case is Toyota RAV4. This includes every type of maintenance, including the air/fuel ratio sensor.

Quality Parts Checking:

When repairing or adjusting your vehicle components or parts, use the proper and recommended OEM parts that your certified technician recommends for Toyota vehicles.

Conclusion:

In conclusion, the P1155 error code can cause concern for Toyota RAV4 owners, but it is not as dangerous as you think. By understanding the causes, you can fix them and prevent them from happening again. Whenever you face this issue, it would be best to discuss it with a professional expert.