P1135 (Volkswagen, Audi, Skoda, Seat) Heater Sensor (HO2S) 2 Circuit Malfunction, Bank 1+2
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P1135 – OBD-II Trouble Code Technical Description
Trouble code P1107 indicates a malfunction in the heater sensor (HO2S) 2 bank 1 and 2 circuit in Volkswagen, Audi, Skoda, Seat vehicles.
What does the fault code mean P1135?
Trouble code P1135 indicates a problem with the engine oxygen sensor (HO2S) 2 bank 1 and 2 heater circuit. This sensor is required to measure oxygen levels in the exhaust gases, which helps the engine management system maintain optimal fuel and air mixing for efficient combustion and reduced emissions.
This code can cause engine instability, poor fuel economy, and increased emissions. Therefore, it is important to diagnose and fix the problem as soon as possible to avoid further damage and problems with the car.
Possible reasons
Trouble code P1135 can be caused by the following reasons:
- Control Circuit Failure: Problems with the wiring, connectors, or electrical contacts can cause the oxygen sensor to heat insufficiently or incorrectly.
- Faulty oxygen sensor heater: The oxygen sensor heating element itself may have failed due to wear or damage.
- Incorrect electrical connections: Poor connections or corrosion in electrical connections can cause the sensor heater to operate erratically.
- Oxygen Sensor Problems: A problem with the oxygen sensor itself can also cause trouble code P1135 to appear.
It is important to conduct a thorough diagnosis to determine the exact cause of the error and take appropriate measures to eliminate it.
What are the symptoms of a fault code? P1135?
Symptoms for DTC P1135 may vary depending on the specific operating conditions of the vehicle and the nature of the problem:
- Increased fuel consumption: If the oxygen sensor does not heat up properly or is not functioning properly, it may cause the engine to receive fuel incorrectly, which may cause increased fuel consumption.
- Power Loss: An incorrect fuel/air mixture can affect engine performance, which may result in loss of power during acceleration or under load.
- Unstable engine operation: A malfunctioning oxygen sensor can cause the engine to run rough or idle erratically.
- Black smoke from the exhaust pipe: If the fuel mixture is too rich, excessive black smoke may be produced from the exhaust system.
- Sparks in the exhaust system: If the oxygen sensor does not work properly, sparking may occur in the exhaust system, especially when the fuel is not burned.
How to diagnose a fault code P1135?
To diagnose DTC P1135, follow these steps:
- Checking the oxygen sensor connection: Check the condition and reliability of the connection of the oxygen sensor to its connector. Make sure the connection is secure and there is no damage to the wires.
- Checking the sensor heater resistance: Use a multimeter to measure the resistance of the oxygen sensor heater. Normal resistance is usually within the range specified in the technical documentation for a particular vehicle.
- Checking the heater control circuit: Check the sensor heater control circuit for shorts or opens. Also make sure that the control signals are coming correctly from the engine management system.
- Checking the status of the oxygen sensor: If all of the above steps do not reveal any problems, the oxygen sensor itself may be faulty and needs to be replaced. Check the technical documentation to determine the correct sensor test procedure.
- Checking other systems: Sometimes the problem can be related to other systems in the car, such as the fuel injection system or ignition system. Check these systems for problems that could cause the fuel mixture to become too rich.
If available, it is also recommended to use a diagnostic scanner to read additional data and trouble codes that may help identify the cause of the problem. If necessary, it is better to contact professionals with experience in dealing with this type of problem.
Diagnostic errors
When diagnosing DTC P1135, the following errors are possible:
- Incorrect interpretation of data: Some mechanics may misinterpret diagnostic data, which can lead to the cause of the problem being misidentified.
- Ignoring other systems: Sometimes mechanics may focus only on the oxygen sensor and not pay attention to other systems such as the fuel injection system or ignition system, which can lead to additional problems being missed.
- Incorrect component replacement: Without proper diagnostics, mechanics may replace expensive components such as an oxygen sensor unnecessarily, which may be unnecessary and may not solve the problem.
- Incorrect control circuit diagnosis: An error may occur when diagnosing the oxygen sensor heater control circuit. Insufficient testing for opens or shorts can lead to an incorrect conclusion about the condition of the circuit.
- Using uncalibrated equipment: Using uncalibrated or faulty diagnostic equipment may result in incorrect results and additional errors.
To prevent these errors, it is important to follow standard diagnostic procedures, check for all possible causes of the problem, and use reliable and calibrated equipment.
How serious is the fault code? P1135?
Trouble code P1135 indicates a problem in the engine oxygen sensor (HO2S) heater circuit 2 bank 1 and 2. Although this may not seem serious at first, since it is related to the heater, which usually does not affect the basic operation of the engine, it should still be considered seriously.
An insufficient or improperly functioning oxygen sensor can cause the fuel injection system to operate ineffectively, which can ultimately lead to improper fuel and air mixing. This, in turn, can lead to increased fuel consumption, poor engine performance, and higher emissions.
Therefore, although P1135 is not a critical trouble code, it should be taken seriously and it is recommended that diagnosis and repair be carried out as soon as possible to avoid further problems with engine performance and vehicle efficiency.
What repair will help eliminate the code? P1135?
To resolve the P1135 code, it is important to follow these steps:
- Checking the Oxygen Sensor (HO2S) Heater: First you should check the oxygen sensor heater itself. This includes checking its resistance, making sure it is functioning correctly and has no shorts or opens.
- Electrical circuit check: The next step is to check the electrical circuit, including the wiring, connectors and connections. It is necessary to make sure that the electrical circuit of the sensor heater is intact and has no breaks, short circuits or oxidation.
- Replacing the oxygen sensor heater: If the oxygen sensor heater is faulty, it should be replaced. A new heater must be installed that will function properly and allow the engine management system to operate properly.
- Checking other system components: In case the problem is not related to the oxygen sensor heater, it may be worth checking other engine management system components such as the oxygen sensor, mass air flow and fuel pump.
- Clearing errors and re-diagnosis: After all necessary repairs and system component replacements have been completed, the error code should be cleared using a diagnostic scanner. After this, it is recommended to run diagnostics again to ensure that the problem is completely resolved.
Contact a professional mechanic or auto repair shop for a more accurate diagnosis and repair of the P1135 code.
