U252F Diagnostic Trouble Code

U252F 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 U252F diagnostic trouble code may include:

Poor fuel economy
Possible spark knock (detonation / pre-ignition)
Misfire
Diminished fuel efficiency

Possible Causes :

Faulty IMRC actuator/sensor
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

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. 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. Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness.

Process Tips

Diagnostic trouble code U252F 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 U252F.

Fortunately, U252F is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U252F Trouble Code For Specific Cars

U252F Pontiac 25 Exhaust Gas Recirculation Sensor B Circuit Low
U252F Mercedes Slr Mclaren Air Bag Driver Circuit Open
U252F Audi Coupe APLSOL Solenoid Circuit Malfunction
U252F Holden Sv6 Power Window LR Motor Circuit Short To Battery
U252F Maxwell Model Dr. Transmission Range Sensor Circuit Low Input
U252F Simca Plein Ceil Intermediate Shaft Speed Sensor Circuit
U252F Austin Montego Aux A/C Blower Speed 1 Circuit Short to Ground