Technical Description of OBD-II Trouble Code
The circuit for the Exhaust Gas Temperature EGT Sensor on Bank 2 Sensor 2 is experiencing a range/performance issue.
What does that mean?
This is a generic powertrain code that is applicable to most makes and models manufactured from 1996 onwards. This code can be found in vehicles from various brands such as Ford, Dodge / Ram, Mercedes-Benz, Alfa Romeo, GMC, Chevrolet, Smart, VW, Audi, etc. However, the specific troubleshooting steps may vary depending on the vehicle.
The diagnostic trouble code (DTC) P2086 indicates a problem with the EGT (exhaust gas temperature) sensor located in the pipe downstream of the catalytic converter. The purpose of this sensor is to protect the converter from damage caused by excessive heat.
Code P2086 signifies that there is an out of range or performance issue within the EGR temperature sensor circuit on bank 2, sensor #2. Bank #2 refers to the side of the engine that does not contain cylinder #1.
An EGT sensor is commonly found in most late model gas or diesel engines. It functions as a heat sensitive resistor that converts the exhaust temperature into a voltage signal for the computer. It receives a 5-volt signal from the computer through one wire, while the second wire serves as the ground.
Here is an example of an EGT exhaust temperature sensor:
The resistance to ground decreases and the voltage increases as the exhaust temperature rises. Conversely, the resistance increases and the voltage decreases as the temperature decreases. If the engine detects a low voltage, the computer will adjust the engine’s timing or fuel ratio to maintain an acceptable temperature within the converter.
In a diesel engine, the EGT is used to determine the timing of regeneration of the DPF (diesel particulate filter) based on the temperature rise.
If a catless up pipe has been installed and the catalytic converter has been removed, there is usually no provision for the EGT sensor. If there is a provision, it may not function correctly without the back pressure, which can trigger this code.
Symptoms
The check engine light will illuminate and the computer will store the code P2086. No other noticeable symptoms will be present.
Potential Causes
The potential causes for this DTC may include:
P2086 Repair Procedures
Another reason for this code to be triggered is if the catalytic converter has been replaced with a catback system. In most states, this is considered an illegal modification and can result in a significant fine if caught. It is advisable to check local and state laws regarding the removal of the catalytic converter, as it leads to uncontrolled emissions into the atmosphere. While the resistor method mentioned earlier may temporarily reset the code, it is important to address the underlying issue to maintain a clean atmosphere for future generations.
If for any reason it is not possible to mechanically resolve this issue, there is an option to permanently delete this specific DTC. However, all other codes will still be active. To proceed with this option, upload your ECU file to our portal.
