C0285 Diagnostic Trouble Code

C0285 is a kind of OBD-II Diagnostic C-Chassis 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 C0285 diagnostic trouble code may include:

Lack of power
Faulty O2 Sensor
Poor acceleration
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

Repair Processes :

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. 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. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors.

Process Tips

Diagnostic trouble code C0285 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 C0285.

Fortunately, C0285 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0285 Trouble Code For Specific Cars

C0285 Lancia Artena Speed Wheel Sensor LF Circuit Open
C0285 Skoda Kamiq Kickdown Relay Pull - In Circuit Fault
C0285 Mercury Milan Air Suspension Rear Height Sensor High (SE) Signal Circuit Short To Battery
C0285 Talbot 2500 Mirror Passenger Horizontal Feedback Potentiometer Circuit Open
C0285 Steyr G-series Lamp Tail Output Circuit Short To Battery
C0285 Aster 24 Air Suspension RF Corner Down Timeout
C0285 Citroen C5 Fuel Composition Sensor Circuit Malfunction