OBD Codes
Your OBD-II Trouble Codes Repair Site

P2086 EGT Sensor Circ Performance Bank 2 Sensor 2

OBD-II Trouble Code Technical Description

Article by
Don Bowman
ASE Certified Automotive Tech

Exhaust Gas Temperature EGT Sensor Circuit Range/Performance Bank 2 Sensor 2

What does that mean?

This is a generic powertrain code, which means it applies to most makes/models, 1996-newer. Brands may include Ford, Dodge / Ram, Mercedes-Benz, Alfa Romeo, GMC, Chevrolet, Smart, VW, Audi, etc. However, specific troubleshooting steps will vary depending on the vehicle.

This diagnostic trouble code (DTC) P2086 refers to the condition of the EGT (exhaust gas temperature) sensor located in the pipe downstream of the catalytic converter. Its sole purpose in life is to protect the converter from damage due to excessive heat.

Code P2086 denotes a detected out of range or performance problem within the EGR temperature sensor circuit on bank 2, sensor #2. This P2086 DTC refers to Bank #2 (which is the side of the engine that does not contain cylinder #1).

An EGT sensor is found on most late model gas or diesel engines. It's nothing more than a heat sensitive resistor that converts the temperature of the exhaust into a voltage signal to the computer. It receives a 5-volt signal from the computer through one wire while the second wire is ground.

Example of an EGT exhaust temperature sensor:
P2086 EGT exhaust gas temperature sensor

The higher the exhaust temperature the less resistance to ground resulting in a higher voltage -- conversely, the lower the temperature the more the resistance resulting in lower voltage. If the engine senses a low voltage, the computer will vary the engine's timing or fuel ratio to keep the temperature in acceptable ranges within the converter.

In a diesel, 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 along with the removal of the catalytic converter, there is normally no provision for the EGT, or if there is it won't function correctly without the back pressure. This will set the code.


The check engine light will illuminate and the computer will have set the code P2086. No other symptoms will be readily recognizable.

Potential Causes

The causes for this DTC may include:

P2086 Repair Procedures

Another reason for this code to set is if the catalytic converter has been replaced in favor of a catback system. In most states this is an illegal procedure punishable by a large fine if caught. It's advisable to check local and state laws concerning the removal of this system since it allows uncontrolled emissions into the atmosphere. This may work, however it is everyone's obligation to do our part to keep our atmosphere clean for future generations.

Until this is repaired the code can be reset by purchasing a 2.2 ohm resistor for pocket change at any electronic store. Simply dispose of the EGT sensor and plug the resistor into the engine side electrical connector. Wrap it with tape and the computer will be satisfied that the EGT is operating properly.

Related P2086 DTC Discussions

Need more help with a P2086 code?

If you still need help regarding the P2086 trouble code, please post your question in our FREE car repair forums.

NOTE: This information is presented for information purposes only. It is not intended as repair advice and we are not responsible for any actions you take on any vehicle. All information on this site is copyright protected.