U2826 Diagnostic Trouble Code

U2826 is a kind of OBD-II Diagnostic U-Network Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a U2826 diagnostic trouble code may include:

Cherry red hot catalytic converter
Poor acceleration
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Reduction in engine performance, especially at low RPM levels

Possible Causes :

A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Some aftermarket accessories and performance modifications
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.

Process Tips

Diagnostic trouble code U2826 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before U2826.

Fortunately, U2826 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U2826 Trouble Code For Specific Cars

U2826 Sbarro Sv Injection Pump Fuel Metering Control "A" Range/Performance (Cam/Rotor/Injector)
U2826 Kia Ceed Iii Seat Recline Motor Memory Position Out of Range
U2826 Toyota Century O2 Sensor Circuit Malfunction (Bank 2 Sensor 2)
U2826 Lotus 79 Torque Converter/Brake Switch B Circuit Low
U2826 Buick Invicta Cylinder 8 Contribution/Balance Fault
U2826 Humber Super Right Rear Turn Lamp Circuit Failure
U2826 Opel Speedster Door Driver Set Switch Stuck Failure