U208U Diagnostic Trouble Code

U208U 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 U208U diagnostic trouble code may include:

Rich or lean exhaust
Fuel pressure too low
Engine surge
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
Faulty IMRC actuator/sensor

Repair Processes :

Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. 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 U208U 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 U208U.

Fortunately, U208U is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U208U Trouble Code For Specific Cars

U208U Mg Maestro Air Suspension RR Height Sensor Circuit Short To Battery
U208U Volkswagen 1600 Rear Doppler Sensor Circuit Failure
U208U Nissan R300 Crankshaft Position Sensor A Circuit Low Input
U208U Toyota Aa No Latch Signal Sensed on Closing and Door Reversed
U208U American Wayferer Air Suspension LF Air Spring Solenoid Output Circuit Short To Ground
U208U Mazda Cu-x Transmission Transfer Case Disengaged Solenoid Short to Battery
U208U Alldays 30 Air Bag Memory Clear Circuit Failure