Error Code P0435: What It Means & What To Do?

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The error code P0435 can be defined as Catalyst Temperature Sensor Bank 2. This trouble code indicates that there is a problem originating from the engine bank which does not have cylinder #1.

 

This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another. This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code.

The performance of the Catalyst Temperature Sensor Circuit is monitored by the engine control module which measures the temperature of the catalyst. The main function of the catalyst temperature sensor is to increase their resistance with increasing exhaust gas temperature. When the catalyst temperature sensor signal would be not as per the factory specifications, then the ECM would set up the P0435 trouble code.

 

What causes this problem with the Catalyst Temperature Sensor Bank 2?

 

• There can be fuel in the exhaust system
• The fuel usage might be improper
• Defaults in the mass airflow sensor
• Failure in the fuel injector
• There can be some flaws in the fuel regulator
• A coolant temperature sensor might have some issues
• A damaged or leaking flex hose
• Quirky spark plug timing

1. Oxygen Sensor - The P0435 code can also arise due to some issues in Oxygen Sensor. So, it is advised to replace them as soon as possible.
2. Camshaft Sensor - Do you remember when was the last time you got your car Camshaft Sensor checked up? A damaged Camshaft Sensor can cause a lot of issues like displaying P0435 code.
3. Powertrain Control Module - Powertrain Control Module is an important car part which should never be neglected. May be there is some fault in it due to which P0435 code may start flashing.
4. Air Fuel Ratio Sensor - Is your Air Fuel Ratio Sensor damaged or broken? Don’t worry as we have solutions for all your problems.
5. Engine Control Module - Defective car Engine Control Module can be a major reason why P0435 code depicts. So, make sure to replace it online so that you don’t have to face any further issues.

Willing to know some common symptoms of OBD Trouble Code P0435? Your wish is our demand. Have a look at them below:

 

Common Symptoms

 

• Fuel economy might start decreasing
• Illumination in the check engine light
• There can be bad engine performance
• Increase in the emissions

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P0435:

 

• Repair or replace the quirky fuel regulator
• There can be a failure in the fuel injector, so you can always replace it
• Make sure to replace the damaged or leaking flex hose
• Restore the coolant temperature sensor
• If there is fuel in the exhaust system, then this issue should be corrected
• Replace the defective mass airflow sensor

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If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

 

• You must start by visually inspecting the upstream oxygen sensor and the corresponding wiring
• Search for loose connections, damaged wiring, etc. Also, check for exhaust leaks both visually as well as audibly. An exhaust leak can cause a false oxygen sensor code. If damage is found, repair as necessary, clear the code and see if it returns
• The next step would be to check for technical service bulletins regarding the issue. If nothing is found, you will need to move forward to step by step diagnosis of the system
• Here is a generalized procedure, as testing for this code varies between vehicles. To accurately test the system, you'll want to refer to a vehicle make/model specific diagnostic flow chart

Check for other DTCs

 

Oxygen sensor codes can often be set because of engine performance problems that cause an out of balance air/fuel mixture. If there are other DTCs stored, you'll want to address those first before proceeding with oxygen sensor diagnosis

 

Check Sensor Operation

 

This can be done by utilizing a scan tool, or an oscilloscope. Since most individuals don't have access to a scope, so we will cover oxygen sensor diagnosis using a scan tool. Connect the scan tool to the ODB port under the dash.

 

Turn the scan tool on and choose the Bank 2 Sensor 1 voltage parameter from the data list. Bring the engine up to operating temperature and view the sensor operation on the scan tool in graph mode. The sensor should rapidly switch between rich and lean (0.1 volts and 0.9 volts). If the sensor response is sluggish, it is probably faulty and should be replaced immediately

 

If the sensor reads above 0.55 volts constantly, either the sensor has failed, the air/fuel mixture is too rich or there is an open in the sensor signal circuit. If the sensor reads above 0.35 volts constantly, either the sensor has failed, the air/fuel mixture is too lean or there is high resistance or a short in the signal wire to the PCM

 

Check the circuit

 

Oxygen sensors produce their own voltage signal which is sent back to the PCM. Before proceeding, you’ll want to consult the factory wiring diagrams to determine which wires are which

 

To check for continuity between the sensor and PCM, turn the ignition key to the "off" position and disconnect the O2 sensor connector. Connect a digital multimeter set to ohms (with the ignition off) between the O2 sensor signal terminal on the PCM and the signal wire.

 

If the meter reads out of limits (OL) there is an open circuit between the PCM and sensor that will need to be located and repaired. If the meter reads a numeric value, there is continuity.

 

Next, you'll want to check the ground side of the circuit. To do this, turn the ignition key to the "off" position and disconnect the O2 sensor connector. Connect a digital multimeter set to ohms (with the ignition off) between the O2 sensor connector ground terminal and chassis ground. If the meter reads out of limits (OL) there is an open circuit on the ground side of the circuit that will need to be located and repaired. If the meter reads a numeric value, there is continuity to ground.

 

The final step would be to check that the PCM is processing the O2 sensor signal properly. To do this, leave all the connectors attached and insert a back-probe meter lead into the signal terminal at the PCM.

 

Set the digital multimeter to the DC volts setting. With the engine warmed up, compare voltage reading on the meter to that on the scan tool. If the two do no match, the PCM is likely faulty or requires reprogramming.

 

Common Mistakes When Diagnosing The P0435 Code

 

• Replacing the O2 sensors can turn out to be the most common mistake before verifying that they are defective. This is often done to try to avoid replacing the catalytic converter which is a bit expensive; but replacing it would surely solve this issue
• One another mistake which can be made is to not address the concurrent DTCs, which might be left unchecked could trigger repeated catalytic converter failure