U0286 Diagnostic Trouble Code

U0286 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 U0286 diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
Malfunction Indicator Lamp (MIL) illuminated

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.
Faulty IMRC actuator/sensor

Repair Processes :

Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications. 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.

Process Tips

Diagnostic trouble code U0286 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 U0286.

Fortunately, U0286 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0286 Trouble Code For Specific Cars

U0286 Porsche 986 Fuel level Sensor Circuit Low Input
U0286 Dauer Eb HO2S Heater Control Circuit High (Bank 2 Sensor 3)
U0286 Nissan Avenir Climate Control Air Temperature Internal Sensor Motor Circuit Short To Battery
U0286 Frazer Nash Competition No Latch Signal Sensed on Closing and Door Reversed
U0286 Morgan Roadster Brake Motor Warning lamp Circuit Short to Vbatt
U0286 Peugeot Partner Iii Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage/IAT - B Circuit Low Input
U0286 Volvo 164