B2866 Diagnostic Trouble Code

B2866 is a kind of OBD-II Diagnostic B-Body 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 B2866 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.
Rich or lean exhaust

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

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. 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 engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition.

Process Tips

Diagnostic trouble code B2866 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 B2866.

Fortunately, B2866 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B2866 Trouble Code For Specific Cars

B2866 Vauxhall Vx Pressure Transducer Main / Primary Input Circuit Failure
B2866 New Orleans New Orleans Central Lock Feedback Failure
B2866 Rolls-royce 100 Hydraulic Pressure Sensor Range/Performance
B2866 Kaiser Dragon Seat Horizontal Forward/Rearward Potentiometer Feedback Circuit Failure
B2866 Fuldamobil S7 O2 Sensor Circuit High Voltage (Bank 2 Sensor 1)
B2866 Dodge Intrepid Ignition Cylinder Sensor Battery Short
B2866 Osca 1050 Door Passenger Key Cylinder Switch Failure